Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Common Stock	Common Stock Restricted Stock Units	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non- Controlling Interests
Balance at Dec. 31, 2014	$ 645,085	$ 374		$ 217,289	$ 433,641	$ (24,669)	$ 18,450
Balance (in Shares) at Dec. 31, 2014		37,360,515
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	10,220				10,043		177
Issuance of common stock upon stock option exercises	1,121	$ 1		1,120
Issuance of common stock upon stock option exercises (in shares)		100,191
Restricted shares issued (in Shares)			10,856
Issuance of shares pursuant to deferred stock unit awards (in Shares)		12,819
Forfeitures of restricted shares	0	$ 0
Forfeitures of restricted shares (in Shares)		(45,207)
Shares repurchased and retired	(21,926)	$ (13)		(21,913)
Shares repurchased and retired (in Shares)		(1,211,333)
Equity-based compensation expense	4,582			4,582
Currency translation adjustment and derivative transactions, net	(18,095)			0		(16,781)	(1,314)
Balance at Jun. 30, 2015	620,987	$ 362		201,078	443,684	(41,450)	17,313
Balance (in Shares) at Jun. 30, 2015		36,227,841
Balance at Dec. 31, 2015	$ 594,556	$ 361		199,951	425,574	(47,861)	16,531
Balance (in Shares) at Dec. 31, 2015	36,053,499	36,053,499
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	$ (756)				(370)		(386)
Issuance of common stock upon stock option exercises	$ 13	$ 0		13
Issuance of common stock upon stock option exercises (in shares)	18,193	18,193
Restricted shares issued (in Shares)			12,313
Issuance of shares pursuant to deferred stock unit awards (in Shares)		18,272
Forfeitures of restricted shares	$ 0	$ 0
Forfeitures of restricted shares (in Shares)		(16,494)
Shares repurchased and retired	(25,200)	$ (14)		(25,186)
Shares repurchased and retired (in Shares)		(1,365,249)
Equity-based compensation expense	5,616			5,616
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	(5,189)					(5,347)	158
Balance at Jun. 30, 2016	$ 560,486	$ 347		$ 180,394	$ 425,204	$ (53,208)	$ 7,749
Balance (in Shares) at Jun. 30, 2016	34,720,534	34,720,534