Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Common Stock- Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interest
Beginning Balance at Dec. 31, 2014	$ 778,662	$ 4	$ 453,109	$ 321,083	$ (11)	$ (4,412)	$ 8,889
Beginning Balance (in shares) at Dec. 31, 2014		44,422,881
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	412		412
Issuance of common stock (in shares)		37,966
Issuance of common stock in acquisitions (net of issuance costs)	15,310		15,310
Issuance of common stock in acquisitions (net of issuance costs) (in shares)		1,675,000
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased)	(854)					(854)
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased) (in shares)		295,089
Treasury stock activity	(23,473)					(23,473)
Treasury stock activity (in shares)		(2,593,222)
Acquisition of noncontrolling interest	(4,828)						(4,828)
Stock compensation expense	5,161		5,161
Comprehensive income (loss) items	(5,011)				(3,998)		(1,013)
Net income (loss)	(151,710)			(151,392)			(318)
Other	341		375	(11)		(23)
Ending Balance at Dec. 31, 2015	614,010	$ 4	474,367	169,680	(4,009)	(28,762)	2,730
Ending Balance (in shares) at Dec. 31, 2015		43,837,714
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock	316		316
Issuance of common stock (in shares)		33,973
Issuance of common stock in acquisitions (net of issuance costs)	4,051	$ 1	4,050
Issuance of common stock in acquisitions (net of issuance costs) (in shares)		500,000
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased)	(767)					(767)
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased) (in shares)		180,049
Partial termination of capped call options (inclusive of tax impact of $116)	1,863		1,863
Convertible debt extinguishment impact (net of tax impact)	(5,560)		(5,560)
Treasury stock activity	(52,295)					(52,295)
Treasury stock activity (in shares)		(5,998,323)
Acquisition of noncontrolling interest	(179)						(179)
Stock compensation expense	5,896		5,896
Comprehensive income (loss) items	(1,874)		(26)		(1,742)		(106)
Net income (loss)	44,713			44,327			386
Ending Balance at Dec. 31, 2016	610,174	$ 5	480,906	214,007	(5,751)	(81,824)	2,831
Ending Balance (in shares) at Dec. 31, 2016		38,553,413
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased)	(872)					(872)
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased) (in shares)		210,611
Settlement of stock appreciation rights in common stock (net of shares of treasury stock purchased)	(385)					(385)
Settlement of stock appreciation rights in common stock (net of shares of treasury stock purchased) (in shares)		73,725
Acquisition of noncontrolling interest	(3,102)		(271)				(2,831)
Impact of 2036 Senior Notes conversion liability reclassification, net of tax	27,908		27,908
Stock compensation expense	6,909		6,909
Comprehensive income (loss) items	6,029				6,029
Net income (loss)	(79,079)			(79,079)
Ending Balance at Dec. 31, 2017	$ 567,582	$ 5	$ 515,452	$ 134,928	$ 278	$ (83,081)	$ 0
Ending Balance (in shares) at Dec. 31, 2017		38,837,749