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A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.","units":{"segment":[{"start":"2013-01-01","end":"2013-12-31","val":3,"accn":"0001454389-15-000007","fy":null,"fp":null,"form":"8-K","filed":"2015-01-14"},{"start":"2013-01-01","end":"2013-12-31","val":3,"accn":"0001454389-16-000081","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2013"},{"start":"2014-01-01","end":"2014-03-31","val":3,"accn":"0001454389-15-000033","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-07","frame":"CY2014Q1"},{"start":"2014-01-01","end":"2014-06-30","val":3,"accn":"0001454389-15-000055","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-06"},{"start":"2014-01-01","end":"2014-09-30","val":3,"accn":"0001454389-14-000088","fy":2014,"fp":"Q3","form":"10-Q","filed":"2014-11-06"},{"start":"2014-01-01","end":"2014-09-30","val":3,"accn":"0001454389-15-000066","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05"},{"start":"2014-01-01","end":"2014-12-31","val":3,"accn":"0001454389-15-000023","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-06"},{"start":"2014-01-01","end":"2014-12-31","val":3,"accn":"0001454389-16-000081","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2014"},{"start":"2015-01-01","end":"2015-03-31","val":3,"accn":"0001454389-15-000033","fy":2015,"fp":"Q1","form":"10-Q","filed":"2015-05-07"},{"start":"2015-01-01","end":"2015-03-31","val":3,"accn":"0001454389-16-000096","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-10","frame":"CY2015Q1"},{"start":"2015-01-01","end":"2015-06-30","val":3,"accn":"0001454389-15-000055","fy":2015,"fp":"Q2","form":"10-Q","filed":"2015-08-06"},{"start":"2015-01-01","end":"2015-06-30","val":3,"accn":"0001454389-16-000115","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"start":"2015-01-01","end":"2015-09-30","val":3,"accn":"0001454389-15-000066","fy":2015,"fp":"Q3","form":"10-Q","filed":"2015-11-05"},{"start":"2015-01-01","end":"2015-12-31","val":3,"accn":"0001454389-16-000081","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015"},{"start":"2016-01-01","end":"2016-03-31","val":3,"accn":"0001454389-16-000096","fy":2016,"fp":"Q1","form":"10-Q","filed":"2016-05-10","frame":"CY2016Q1"},{"start":"2016-01-01","end":"2016-06-30","val":3,"accn":"0001454389-16-000115","fy":2016,"fp":"Q2","form":"10-Q","filed":"2016-08-04"},{"start":"2016-01-01","end":"2016-09-30","val":3,"accn":"0001454389-16-000150","fy":2016,"fp":"Q3","form":"10-Q","filed":"2016-11-04"},{"start":"2016-01-01","end":"2016-12-31","val":3,"accn":"0001454389-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-09","frame":"CY2016"},{"start":"2017-01-01","end":"2017-03-31","val":3,"accn":"0001454389-17-000016","fy":2017,"fp":"Q1","form":"10-Q","filed":"2017-05-04","frame":"CY2017Q1"}]}},"OperatingLeasesFutureMinimumPaymentsDue":{"label":"Operating Leases, Future Minimum Payments Due","description":"Amount of required minimum rental payments for leases having an initial or remaining non-cancelable letter-terms in excess of one year.","units":{"USD":[{"end":"2013-12-31","val":25785000,"accn":"0001454389-14-000011","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14"},{"end":"2013-12-31","val":25785000,"accn":"0001454389-15-000007","fy":null,"fp":null,"form":"8-K","filed":"2015-01-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":34799000,"accn":"0001454389-15-000023","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-06","frame":"CY2014Q4I"},{"end":"2015-12-31","val":26455000,"accn":"0001454389-16-000081","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"},{"end":"2016-12-31","val":20760000,"accn":"0001454389-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-09","frame":"CY2016Q4I"}]}},"OperatingLeasesFutureMinimumPaymentsDueCurrent":{"label":"Operating Leases, Future Minimum Payments Due, Next Twelve Months","description":"Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2013-12-31","val":4684000,"accn":"0001454389-14-000011","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14"},{"end":"2013-12-31","val":4684000,"accn":"0001454389-15-000007","fy":null,"fp":null,"form":"8-K","filed":"2015-01-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":7536000,"accn":"0001454389-15-000023","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-06","frame":"CY2014Q4I"},{"end":"2015-12-31","val":6314000,"accn":"0001454389-16-000081","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"},{"end":"2016-12-31","val":6532000,"accn":"0001454389-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-09","frame":"CY2016Q4I"}]}},"OperatingLeasesFutureMinimumPaymentsDueInFiveYears":{"label":"Operating Leases, Future Minimum Payments, Due in Five Years","description":"Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2013-12-31","val":3423000,"accn":"0001454389-14-000011","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14"},{"end":"2013-12-31","val":3423000,"accn":"0001454389-15-000007","fy":null,"fp":null,"form":"8-K","filed":"2015-01-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":3827000,"accn":"0001454389-15-000023","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-06","frame":"CY2014Q4I"},{"end":"2015-12-31","val":2177000,"accn":"0001454389-16-000081","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"},{"end":"2016-12-31","val":1487000,"accn":"0001454389-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-09","frame":"CY2016Q4I"}]}},"OperatingLeasesFutureMinimumPaymentsDueInFourYears":{"label":"Operating Leases, Future Minimum Payments, Due in Four Years","description":"Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the fourth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2013-12-31","val":3324000,"accn":"0001454389-14-000011","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14"},{"end":"2013-12-31","val":3324000,"accn":"0001454389-15-000007","fy":null,"fp":null,"form":"8-K","filed":"2015-01-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":5511000,"accn":"0001454389-15-000023","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-06","frame":"CY2014Q4I"},{"end":"2015-12-31","val":3902000,"accn":"0001454389-16-000081","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"},{"end":"2016-12-31","val":2194000,"accn":"0001454389-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-09","frame":"CY2016Q4I"}]}},"OperatingLeasesFutureMinimumPaymentsDueInThreeYears":{"label":"Operating Leases, Future Minimum Payments, Due in Three Years","description":"Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the third fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2013-12-31","val":3691000,"accn":"0001454389-14-000011","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14"},{"end":"2013-12-31","val":3691000,"accn":"0001454389-15-000007","fy":null,"fp":null,"form":"8-K","filed":"2015-01-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":6325000,"accn":"0001454389-15-000023","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-06","frame":"CY2014Q4I"},{"end":"2015-12-31","val":5512000,"accn":"0001454389-16-000081","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"},{"end":"2016-12-31","val":3888000,"accn":"0001454389-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-09","frame":"CY2016Q4I"}]}},"OperatingLeasesFutureMinimumPaymentsDueInTwoYears":{"label":"Operating Leases, Future Minimum Payments, Due in Two Years","description":"Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due in the second fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2013-12-31","val":4299000,"accn":"0001454389-14-000011","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14"},{"end":"2013-12-31","val":4299000,"accn":"0001454389-15-000007","fy":null,"fp":null,"form":"8-K","filed":"2015-01-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":6632000,"accn":"0001454389-15-000023","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-06","frame":"CY2014Q4I"},{"end":"2015-12-31","val":5824000,"accn":"0001454389-16-000081","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"},{"end":"2016-12-31","val":5420000,"accn":"0001454389-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-09","frame":"CY2016Q4I"}]}},"OperatingLeasesFutureMinimumPaymentsDueThereafter":{"label":"Operating Leases, Future Minimum Payments, Due Thereafter","description":"Amount of required minimum rental payments for operating leases having an initial or remaining non-cancelable lease term in excess of one year due after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date.","units":{"USD":[{"end":"2013-12-31","val":6364000,"accn":"0001454389-14-000011","fy":2013,"fp":"FY","form":"10-K","filed":"2014-03-14"},{"end":"2013-12-31","val":6364000,"accn":"0001454389-15-000007","fy":null,"fp":null,"form":"8-K","filed":"2015-01-14","frame":"CY2013Q4I"},{"end":"2014-12-31","val":4968000,"accn":"0001454389-15-000023","fy":2014,"fp":"FY","form":"10-K","filed":"2015-03-06","frame":"CY2014Q4I"},{"end":"2015-12-31","val":2726000,"accn":"0001454389-16-000081","fy":2015,"fp":"FY","form":"10-K","filed":"2016-03-15","frame":"CY2015Q4I"},{"end":"2016-12-31","val":1239000,"accn":"0001454389-17-000006","fy":2016,"fp":"FY","form":"10-K","filed":"2017-03-09","frame":"CY2016Q4I"}]}},"OperatingLeasesRentExpenseNet":{"label":"Operating Leases, Rent Expense, Net","description":"Rental expense for the reporting period incurred under operating leases, including 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