Consolidated Statements Of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Statement of Other Comprehensive Income [Abstract]
Net income	$ 32,302	$ 30,202	$ 81,107	$ 58,354
Unrealized gains on securities
Before tax	3,921	1,212	8,661	15,225
Tax effect	(1,563)	(565)	(3,447)	(6,125)
Net of tax	2,358	647	5,214	9,100
Less: Reclassification of net gains included in net income
Before tax	409	225	2,334	1,483
Tax effect	(162)	(88)	(934)	(583)
Net of tax	247	137	1,400	900
Net Unrealized Gains on Securities	2,111	510	3,814	8,200
Unrealized (losses) gains on derivative instruments
Before tax	(293)	(2,088)	1,439	1,115
Tax effect	119	917	(568)	(332)
Net Unrealized (Losses) Gains on Derivative Instruments	(174)	(1,171)	871	783
Foreign currency translation adjustment
Before tax	8,438	0	11,139	0
Tax effect	(2,541)	0	(3,141)	0
Net foreign currency translation adjustment	5,897	0	7,998	0
Total other comprehensive income (loss)	7,834	(661)	12,683	8,983
Comprehensive income	$ 40,136	$ 29,541	$ 93,790	$ 67,337