Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Restricted Stock Units (RSUs)	Performances Stock Units	Common Stock	Common Stock Restricted Stock Units (RSUs)	Common Stock Performances Stock Units	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non- Controlling Interests
Beginning Balance (in Shares) at Dec. 31, 2015				36,053,499
Beginning Balance at Dec. 31, 2015	$ 593,793			$ 361			$ 200,255	$ 416,642	$ (39,996)	$ 16,531
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 29,125							29,453		(328)
Issuance of common stock upon stock option exercises, including tax benefit (in Shares)	114,307			114,307
Issuance of common stock upon stock option exercises, including tax benefit	$ 1,818			$ 1			1,817
Restricted shares issued (in Shares)					141,507
Restricted shares issued		$ 1			$ 1
Issuance of shares pursuant to deferred stock unit awards (in Shares)				39,660
Forfeitures of restricted shares (in Shares)				(42,775)
Forfeitures of restricted shares	0			$ 0
Shares repurchased and retired (in Shares)				(2,349,894)
Shares repurchased and retired	(44,454)			$ (23)			(44,431)
Equity-based compensation expense	10,059						10,059
Sale of non-controlling interest	7,278									7,278
Sale of non-controlling interest	(1,276)									(1,276)
Currency translation adjustment and derivative transactions, net	(5,605)								(5,639)	34
Ending Balance (in Shares) at Dec. 31, 2016				33,956,304
Ending Balance at Dec. 31, 2016	576,183			$ 340			167,700	446,095	(45,635)	7,683
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (66,582)							(69,401)		2,819
Issuance of common stock upon stock option exercises, including tax benefit (in Shares)	43,573			43,573
Issuance of common stock upon stock option exercises, including tax benefit	$ 822			$ 0			822
Restricted shares issued (in Shares)					95,510	49,672
Restricted shares issued		1	$ 0		$ 1	$ 0
Issuance of shares pursuant to deferred stock unit awards (in Shares)				30,559
Forfeitures of restricted shares (in Shares)				(1,084)
Shares repurchased and retired (in Shares)				(1,711,992)
Shares repurchased and retired	(37,849)			$ (16)			(37,833)
Equity-based compensation expense	10,060						10,060
Sale of non-controlling interest	158									158
Sale of non-controlling interest	(71)									(71)
Currency translation adjustment and derivative transactions, net	$ 22,334								22,113	221
Ending Balance (in Shares) at Dec. 31, 2017	32,462,542			32,462,542
Ending Balance at Dec. 31, 2017	$ 505,056			$ 325			140,749	376,694	(23,522)	10,810
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ 3,087							2,928		159
Issuance of common stock upon stock option exercises, including tax benefit (in Shares)	0
Restricted shares issued (in Shares)					312,182	296,909
Restricted shares issued		$ 3	$ 3		$ 3	$ 3
Issuance of shares pursuant to deferred stock unit awards (in Shares)				28,308
Shares repurchased and retired (in Shares)				(1,177,532)
Shares repurchased and retired	$ (25,781)			$ (12)			(25,769)
Equity-based compensation expense	7,838						7,838
Sale of non-controlling interest	(3,361)									(3,361)
Currency translation adjustment and derivative transactions, net	$ (16,926)								(16,768)	(158)
Ending Balance (in Shares) at Dec. 31, 2018	31,922,409			31,922,409
Ending Balance at Dec. 31, 2018	$ 470,187			$ 319			$ 122,818	$ 379,890	$ (40,290)	$ 7,450