Income Taxes Income Taxes (Components of Income Taxes) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
U.S. Federal	$ 24,246	$ 30,458	$ 33,142
State	6,185	8,313	101
Current Total	30,431	38,771	33,243
Deferred:
U.S. Federal	(5,779)	7,765	(3,381)
State	(1,557)	1,601	1,624
Deferred Total	(7,336)	9,366	(1,757)
Total	$ 23,095	$ 48,137	$ 31,486