Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Net income	$ 111,196	$ 77,575	$ 63,329
Unrealized gains on securities
Before tax	8,793	4,467	9,579
Tax effect	(3,332)	(1,862)	(3,754)
Net of tax	5,461	2,605	5,825
Less: Reclassification of net gains included in net income
Before tax	4,895	1,792	9,832
Tax effect	(1,940)	(712)	(3,787)
Net of tax	2,955	1,080	6,045
Cumulative effect of change in accounting
Before tax	0	0	254
Tax effect	0	0	(98)
Net of tax	0	0	156
Net unrealized gains on securities	2,506	1,525	(64)
Unrealized gains on derivative instruments
Before tax	2,960	1,690	2,164
Tax effect	(1,170)	(581)	(834)
Unrealized gains on derivative instruments	1,790	1,109	1,330
Foreign currency translation adjustment
Before tax	8,249	0	0
Tax effect	(1,956)	0	0
Net foreign currency translation adjustment	6,293	0	0
Total other comprehensive income	10,589	2,634	1,266
Comprehensive income	$ 121,785	$ 80,209	$ 64,595