Segment Reporting - Reconciliation of EBITDA to Income Before Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Reconciliation of total segment EBITDA to income before taxes
Total segment EBITDA from continuing operations									$ 83,401	$ 47,023	$ 37,620
Interest, net									(18,328)	(7,508)	(7,838)
Provision for income taxes									(17,846)	(10,291)	(6,988)
Depreciation and amortization									(15,966)	(13,252)	(11,595)
Net income from continuing operations	$ (1,615)	$ 14,760	$ 12,155	$ 5,960	$ 5,638	$ 6,768	$ 3,070	$ 496	$ 31,261	$ 15,972	$ 11,199