Income Taxes Components of Income Tax Expense (Benefit) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Pre-tax income from U.S. jurisdiction	$ 28,000,000
Pre-tax income from foreign jurisdictions	316,000
Current:
Federal	8,847,000	9,906,000	29,141,000
State	(1,731,000)	585,000	2,522,000
Foreign	563,000	0	0
Total current	7,679,000	10,491,000	31,663,000
Deferred:
Federal	(8,489,000)	3,514,000	(6,259,000)
State	16,901,000	(263,000)	(477,000)
Foreign	(125,000)	0	0
Total deferred	8,287,000	3,251,000	(6,736,000)
Total provision	$ 15,966,000	$ 13,742,000	$ 24,927,000