Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	6 Months Ended
Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Other comprehensive income (loss), before-tax amount
Foreign currency translation adjustments, before-tax amount	$ (1,965)	$ (6,900)	$ 1,288	$ (6,900)
Unrealized holding gains (losses) on available-for-sale securities, before tax amount	(69,393)	25,269	(18,372)	93,069
Recognition of previously unrealized (gains) losses on available-for-sale securities included in net income (loss), before tax amount	(3,135)	4,658	(84,022)	(1,638)
Other comprehensive income (loss), before-tax amount	(74,493)	23,027	(101,106)	84,531
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax	(1,965)	(6,900)	1,288	(6,900)
Unrealized holding gains (losses) on available-for-sale securities, net of tax	(69,393)	25,269	(18,372)	93,069
Recognition of previously unrealized (gains) losses on available-for-sale securities included in net income (loss), net of tax	(3,135)	4,658	(84,022)	(1,638)
Total other comprehensive income (loss), net of tax	(74,493)	23,027	(101,106)	84,531
Accumulated other comprehensive income (loss)
Foreign currency translation adjustments, balance at beginning of period, net			(9,139)
Foreign currency translation adjustments, before-tax amount, current period activity	(1,965)	(6,900)	1,288	(6,900)
Foreign currency translation adjustments, balance at end of period, net	(7,851)		(7,851)
Unrealized / Recognized Gains (Losses), balance at beginning of period, net			91,182
Unrealized / Recognized Gains (Losses), Current period activity			(102,394)
Unrealized / Recognized Gains (Losses), balance at end of period, net	(11,212)		(11,212)
Accumulated other comprehensive income (loss), balance at beginning of period, net			82,043
Other comprehensive income (loss), current period activity	(74,493)	23,027	(101,106)	84,531
Accumulated other comprehensive income (loss), balance at end of period, net	$ (19,063)		$ (19,063)

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