Consolidated Statements Of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Statement of Other Comprehensive Income [Abstract]
Net income	$ 32,052	$ 23,210
Unrealized losses on securities
Before tax	(7,455)	(3,219)
Tax effect	2,806	1,276
Net of tax	(4,649)	(1,943)
Less: Reclassification of net gains included in net income
Before tax	251	816
Tax effect	(100)	(327)
Net of tax	151	489
Net unrealized losses on securities	(4,800)	(2,432)
Unrealized gains on derivative instruments
Before tax	1,474	796
Tax effect	(586)	(316)
Net unrealized gains on derivative instruments	888	480
Foreign currency translation adjustment
Before tax	(6,304)	0
Tax effect	1,438	0
Net foreign currency translation adjustment	(4,866)	0
Total other comprehensive loss	(8,778)	(1,952)
Comprehensive income	$ 23,274	$ 21,258