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									$ 17,613	$ 17,645	$ 15,789
Foreign									47	34	68
State and local									3,414	3,709	3,232
Total									21,074	21,388	19,089
Deferred:
Federal									(1,116)	(2,580)	(2,137)
State and local									(630)	(425)	65
Total									(1,721)	(2,899)	(2,079)
Total income tax expense from continuing operations	(58)	2,458	3,512	13,416	(1,913)	1,614	5,095	13,587	19,328	18,383	17,017
Operations of discontinued operations:
Current									(38)	(472)	(1,733)
Deferred									25	106	(7)
Total									(13)	(366)	(1,740)
Gain (loss) on disposal of discontinued operations:
Current									53	193	(812)
Total income tax expense (benefit) from discontinued operations									40	(173)	(2,552)
Total income tax expense									$ 19,368	$ 18,210	$ 14,465