Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Cash paid for:
Interest	$ 269	$ 320	$ 789	$ 984
Income taxes for continuing operations	1,928	1,578	5,051	3,107
Income taxes for discontinued operations				5
Total	2,197	1,898	5,840	4,096
Income Taxes
Tax expense	$ 6,588	$ 3,926	$ 14,366	$ 6,031
Effective tax rate (as a percent)			38.80%	46.50%
Federal statutory income taxes rate (as a percent)			35.00%	35.00%
State income taxes rate (as a percent)			(3.80%)	(3.20%)
Income attributable to noncontrolling interest (as a percent)				(4.40%)
Tax reserves (as a percent)				(3.10%)