Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Federal:
Current	$ 51,342	$ 45,765	$ 51,717
Deferred	(27,103)	17,330	11,536
Federal, Total	24,239	63,095	63,253
State:
Current	9,896	10,710	12,892
Deferred	(5,081)	2,222	1,957
State, Total	4,815	12,932	14,849
Current Foreign Tax Expense (Benefit)	4,035	0	0
Deferred Foreign Income Tax Expense (Benefit)	(1,214)	0	0
Foreign Income Tax Expense (Benefit), Continuing Operations	2,821	0	0
Income Tax Expense (Benefit), Total	$ 31,875	$ 76,027	$ 78,102