Condensed Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Net income	$ 17,932	$ 17,549	$ 14,137	$ 67,223
Net unrealized gains (losses) on investment securities available for sale:
Change in net unrealized gains (losses)	883	1,933	(13,386)	5,353
Net unrealized gains reclassified into net income	(1,640)	(6,017)	(1,640)	(20,558)
Net unrealized losses on investment securities available for sale	(757)	(4,084)	(15,026)	(15,205)
Net unrealized gains (losses) on long-term investments accounted for under the equity method	476	(1,549)	1,018	(3,002)
Net change in forward contracts	15	18	47	49
Net change in pension-related amounts	870	680	2,611	2,040
Other comprehensive income (loss)	604	(4,935)	(11,350)	(16,118)
Income tax effect on change in net unrealized gains (losses) on investment securities	(358)	(1,025)	5,435	(2,393)
Income tax effect on net unrealized gains reclassified into net income on investment securities	665	2,531	665	8,347
Income tax effect on change in unrealized long-term investments	(193)	629	(413)	1,212
Income tax effect on net unrealized gains relcassified inot net income on long-term investments	0	0	0	0
Income tax effect on forward contracts	(6)	(5)	(19)	(19)
Income tax effect on pension-related amounts	(353)	(105)	(1,060)	(649)
Income taxes (provision) benefit on other comprehensive income (loss)	(245)	2,025	4,608	6,498
Other comprehensive income (loss), net of tax	359	(2,910)	(6,742)	(9,620)
Total comprehensive income	$ 18,291	$ 14,639	$ 7,395	$ 57,603