Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current:
Federal									$ 6,160	$ 1,820	$ 4,320
State									1,150	510	1,000
Total current									7,399	2,504	5,539
Total deferred									4,540	6,100	5,080
Income tax expense benefit									11,850	8,430	10,400
Taxes are allocated as follows:
Continuing operations	3,489	3,227	3,438	1,785	2,674	2,473	2,251	1,206	11,939	8,604	10,619
Discontinued operations									(89)	(174)	(219)
Income tax expense benefit									$ 11,850	$ 8,430	$ 10,400