Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Restricted Stock	Restricted Stock Units (RSUs)	Common Stock	Common Stock Restricted Stock	Common Stock Restricted Stock Units (RSUs)	Additional Paid-In Capital	Additional Paid-In Capital Restricted Stock Units (RSUs)	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non- Controlling Interests
Beginning Balance at Dec. 31, 2013	$ 726,921			$ 380			$ 236,128		$ 470,808	$ 2,052	$ 17,553
Beginning Balance (in Shares) at Dec. 31, 2013				37,983,114
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(35,412)								(37,167)		1,755
Issuance of common stock upon stock option exercises, including tax benefit	$ 8,075			$ 5			8,070
Issuance of common stock upon stock option exercises, including tax benefit (in shares)	526,359			526,359
Restricted shares issued		$ 2			$ 2
Restricted shares issued (in Shares)					242,722	15,277
Issuance of shares pursuant to deferred stock unit awards (in Shares)				31,794
Forfeitures of restricted shares	$ (1)			$ (1)
Forfeitures of restricted shares (in Shares)				(104,013)
Shares repurchased and retired	(31,085)			$ (12)			(31,073)
Shares repurchased and retired (in Shares)				(1,334,738)
Equity-based compensation expense	5,073						5,073
Purchase of non-controlling interests	(617)						(909)				292
Currency translation adjustment and derivative transactions, net	(27,871)									(26,721)	(1,150)
Ending Balance at Dec. 31, 2014	645,085			$ 374			217,289		433,641	(24,669)	18,450
Ending Balance (in Shares) at Dec. 31, 2014				37,360,515
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(7,990)								(8,067)		77
Issuance of common stock upon stock option exercises, including tax benefit	$ 2,466			$ 2			2,464
Issuance of common stock upon stock option exercises, including tax benefit (in shares)	209,205			209,205
Restricted shares issued (in Shares)						12,646
Issuance of shares pursuant to deferred stock unit awards (in Shares)				27,779
Forfeitures of restricted shares	$ (1)			$ (1)
Forfeitures of restricted shares (in Shares)				(54,045)
Shares repurchased and retired	(27,803)			$ (14)			(27,789)
Shares repurchased and retired (in Shares)				(1,502,601)
Equity-based compensation expense	7,987						7,987
Investment by non-controlling interests	239						0				239
Purchase of non-controlling interests	(472)						0				(472)
Currency translation adjustment and derivative transactions, net	(24,955)									(23,192)	(1,763)
Ending Balance at Dec. 31, 2015	$ 594,556			$ 361			199,951		425,574	(47,861)	16,531
Ending Balance (in Shares) at Dec. 31, 2015	36,053,499			36,053,499
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 29,160								29,488		(328)
Issuance of common stock upon stock option exercises, including tax benefit	$ 1,818			$ 1			1,817
Issuance of common stock upon stock option exercises, including tax benefit (in shares)	114,307			114,307
Restricted shares issued						$ 1		$ 0
Restricted shares issued (in Shares)			1,000			141,507
Issuance of shares pursuant to deferred stock unit awards (in Shares)				39,660
Forfeitures of restricted shares				$ 0
Forfeitures of restricted shares (in Shares)				(42,775)
Shares repurchased and retired	$ (44,454)			$ (23)			(44,431)
Shares repurchased and retired (in Shares)				(2,349,894)
Equity-based compensation expense	9,261						9,261
Sale of non-controlling interest	(7,278)										(7,278)
Distributions to non-controlling interests	(1,276)										(1,276)
Currency translation adjustment and derivative transactions, net	(5,605)									(5,639)	34
Ending Balance at Dec. 31, 2016	$ 576,183			$ 340			$ 166,598		$ 455,062	$ (53,500)	$ 7,683
Ending Balance (in Shares) at Dec. 31, 2016	33,956,304			33,956,304