Income Taxes Income Taxes (Schedule of Income Tax Expense (Benefit)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal	$ 52,391	$ 27,674	$ (1,588)
State and local	1,282	1,302	1,575
Current Total	53,673	28,976	(13)
Deferred:
Federal	20,012	28,497	12,950
State and local	980	478	(579)
Deferred Total	20,992	28,975	12,371
Total:
Federal	72,403	56,171	11,362
State and local	2,262	1,780	996
Reported Income tax expense	$ 74,665	$ 57,951	$ 12,358