Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Statement of Income and Comprehensive Income [Abstract]
Net (loss) income	$ (7,690)	$ 19,373
Net unrealized (losses) gains on investment securities available for sale:
Change in net unrealized (losses) gains	(11,244)	4,370
Net unrealized gains reclassified into net income	0	(13,035)
Net unrealized (losses) gains on investment securities available for sale	(11,244)	(8,665)
Net unrealized gains on long-term investments accounted for under the equity method:
Net unrealized gains on long-term investments accounted for under the equity method	3,047	432
Net change in forward contracts	15	16
Net change in pension-related amounts	870	681
Other comprehensive loss	(7,312)	(7,536)
Income tax effect on:
Change in net unrealized losses (gains) on investment securities	4,565	(1,748)
Net unrealized gains reclassified into net income on investment securities	0	5,214
Change in unrealized gains on long-term investments	(1,237)	(173)
Forward contracts	(6)	(8)
Pension-related amounts	(353)	(272)
Income tax benefit on other comprehensive loss	2,969	3,013
Other comprehensive loss, net of income taxes	(4,343)	(4,523)
Comprehensive (loss) income	$ (12,033)	$ 14,850