Comprehensive Income (Loss) (Details) (USD $) In Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Comprehensive income (loss)
Net income (loss) from continuing operations	$ 16,594	$ (5,522)	$ 19,753	$ (224,535)
Net income from discontinued operations, net of tax		2,166		9,489
Gain from sale of discontinued operations, net of tax		21,696		21,696
Net income (loss)	16,594	18,340	19,753	(193,350)
Unrealized gain on available-for-sale securities, net of tax	20,454	5,715	25,297	6,475
Unrealized gain (loss) on foreign currency translation, net of tax	1,878	(20,001)	11,460	(29,973)
Unrealized loss on cash flow hedges, net of taxes		(22)		(44)
Comprehensive income (loss)	$ 38,926	$ 4,032	$ 56,510	$ (216,892)