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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Cash paid for:
Interest	$ 623	$ 509	$ 884	$ 520
Income taxes	405	2,525	924	3,123
Total	1,028	3,034	1,808	3,643
Income Taxes
Tax expense	$ 3,746	$ 5,735	$ 4,438	$ 7,778
Effective tax rate (as a percent)			37.40%	41.30%
Federal statutory income taxes rate (as a percent)			35.00%	35.00%
State income taxes rate (as a percent)			4.00%	4.00%
Foreign income taxes rate (as a percent)				2.90%
Noncontrolling interest (as a percent)			2.40%

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