Income Taxes (Income Tax Expense from Cont. Ops) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Current:
Federal	$ 11,809	$ 11,233	$ 16,409
State	3,573	3,327	4,291
Deferred:
Federal	17,976	16,402	11,552
State	2,483	2,829	2,095
Income from continuing operations	$ 35,841	$ 33,791	$ 34,347