Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Restricted Stock	Common Stock	Common Stock Restricted Stock	Common Stock Restricted Stock Units (RSUs)	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Non- Controlling Interests
Beginning Balance at Dec. 31, 2012	$ 716,120		$ 390			$ 257,209	$ 426,457	$ 15,260	$ 16,804
Beginning Balance (in Shares) at Dec. 31, 2012			38,952,561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	45,546						44,351		1,195
Issuance of common stock upon stock option exercises, including tax benefit	$ 899					899
Issuance of common stock upon stock option exercises, including tax benefit (in shares)	29,511		29,511
Restricted shares issued		$ 4		$ 4
Restricted shares issued (in Shares)				435,025	13,761
Issuance of shares pursuant to deferred stock unit awards (in Shares)			7,029
Forfeitures of restricted shares	$ (2)		$ (2)
Forfeitures of restricted shares (in Shares)			(236,388)
Shares repurchased and retired	(27,648)		$ (12)			(27,636)
Repurchase of common stock (in Shares)			(1,218,385)
Equity-based compensation expense	5,647					5,647
Currency translation adjustment and derivative transactions, net	(13,645)					9		(13,208)	(446)
Ending Balance at Dec. 31, 2013	726,921		$ 380			236,128	470,808	2,052	17,553
Ending 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)
Repurchase of common stock (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)					0		(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		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)
Repurchase of common stock (in Shares)			(1,502,601)
Equity-based compensation expense	7,987					7,987
Sale of non-controlling interest	239
Distributions to non-controlling interests	(472)								(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