Income Taxes (Components Of Income Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Federal
Current	$ 9,340	$ 31,390	$ 23,699
Deferred	6,238	20,518	9,964
Total	15,578	51,908	33,663
State
Current	2,079	2,934	(3,225)
Deferred	742	(907)	(246)
Total	2,821	2,027	(3,471)
Total, Current	11,419	34,324	20,474
Total, Deferred	6,980	19,611	9,718
Total	$ 18,399	$ 53,935	$ 30,192