Condensed Consolidated Statements of Equity (unaudited) - 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
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased)	(599)					(599)
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased) (in shares)		174,498
Treasury stock purchases	(11,519)					(11,519)
Treasury stock purchases (in shares)		(1,193,657)
Acquisition of noncontrolling interest	(4,171)						(4,171)
Stock compensation expense	2,236		2,236
Other comprehensive income (loss)	(3,891)				(3,321)		(570)
Net income (loss)	(40,467)			(40,108)			(359)
Ending Balance at Jun. 30, 2015	720,663	$ 4	455,757	280,975	(3,332)	(16,530)	3,789
Ending Balance (in shares) at Jun. 30, 2015		43,441,688
Beginning Balance at Dec. 31, 2015	614,010	$ 4	474,367	169,680	(4,009)	(28,762)	2,730
Beginning 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 acquisition	4,050	$ 1	4,049
Issuance of common stock in acquisition (in shares)		500,000
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased)	(752)					(752)
Conversion of restricted stock units to common stock (net of shares of treasury stock purchased) (in shares)		178,285
Partial termination of capped call options	1,588		1,588
Convertible debt extinguishment impact (net of tax impact of $2,144)	(5,085)		(5,085)
Treasury stock purchases	(46,705)					(46,705)
Treasury stock purchases (in shares)		(5,370,771)
Acquisition of noncontrolling interest	(179)						(179)
Stock compensation expense	1,934		1,934
Other comprehensive income (loss)	312				411		(99)
Net income (loss)	8,810			8,672			138
Ending Balance at Jun. 30, 2016	$ 578,299	$ 5	$ 477,169	$ 178,352	$ (3,598)	$ (76,219)	$ 2,590
Ending Balance (in shares) at Jun. 30, 2016		39,179,201