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Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect","description":"Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. 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This item includes treasury stock repurchased by the entity. Note: elements for number of nonredeemable common shares, par value and other disclosure concepts are in another section within stockholders' 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Alternate caption for the concept is permanent 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Trading generally reflects active and frequent buying and selling, and trading securities are generally used with the objective of generating profits on short-term differences in price, but this category of investments may also include items which are not intended to be sold in the near term or for which the fair value option has been elected.","units":{"USD":[{"end":"2010-12-31","val":5361000,"accn":"0001057877-12-000044","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22","frame":"CY2010Q4I"},{"end":"2010-12-31","val":5361000,"accn":"0001057877-11-000176","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-03"},{"end":"2010-12-31","val":5361000,"accn":"0001057877-11-000155","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-04"},{"end":"2011-06-30","val":3629000,"accn":"0001057877-11-000155","fy":2011,"fp":"Q2","form":"10-Q","filed":"2011-08-04","frame":"CY2011Q2I"},{"end":"2011-09-30","val":3239000,"accn":"0001057877-11-000176","fy":2011,"fp":"Q3","form":"10-Q","filed":"2011-11-03","frame":"CY2011Q3I"},{"end":"2011-12-31","val":3439000,"accn":"0001057877-13-000040","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-21","frame":"CY2011Q4I"},{"end":"2011-12-31","val":3439000,"accn":"0001057877-12-000154","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-01"},{"end":"2011-12-31","val":3439000,"accn":"0001057877-12-000139","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-02"},{"end":"2011-12-31","val":3439000,"accn":"0001057877-12-000118","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-03"},{"end":"2011-12-31","val":3439000,"accn":"0001057877-12-000044","fy":2011,"fp":"FY","form":"10-K","filed":"2012-02-22"},{"end":"2012-03-31","val":2370000,"accn":"0001057877-12-000118","fy":2012,"fp":"Q1","form":"10-Q","filed":"2012-05-03","frame":"CY2012Q1I"},{"end":"2012-06-30","val":2350000,"accn":"0001057877-12-000139","fy":2012,"fp":"Q2","form":"10-Q","filed":"2012-08-02","frame":"CY2012Q2I"},{"end":"2012-09-30","val":2456000,"accn":"0001057877-12-000154","fy":2012,"fp":"Q3","form":"10-Q","filed":"2012-11-01","frame":"CY2012Q3I"},{"end":"2012-12-31","val":2478000,"accn":"0001057877-13-000152","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-01","frame":"CY2012Q4I"},{"end":"2012-12-31","val":2478000,"accn":"0001057877-13-000128","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-02"},{"end":"2012-12-31","val":2478000,"accn":"0001057877-13-000040","fy":2012,"fp":"FY","form":"10-K","filed":"2013-02-21"},{"end":"2013-03-31","val":948000,"accn":"0001057877-13-000128","fy":2013,"fp":"Q1","form":"10-Q","filed":"2013-05-02","frame":"CY2013Q1I"},{"end":"2013-06-30","val":1105000,"accn":"0001057877-13-000152","fy":2013,"fp":"Q2","form":"10-Q","filed":"2013-08-01","frame":"CY2013Q2I"}]}},"TreasuryStockShares":{"label":"Treasury Stock, Shares","description":"Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. 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Stock, Value","description":"The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its 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