Consolidated Statements of Equity - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	Restricted Stock Units (RSUs) [Member]	Performance Shares [Member]	Common Stock [Member]	Common Stock [Member] Restricted Stock Units (RSUs) [Member]	Common Stock [Member] Performance Shares [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative Effect, Period of Adoption, Adjusted Balance [Member]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Balance, beginning of year (in shares) at Dec. 31, 2017					32,462,542
Issuance of common stock upon stock option exercises (in shares)	(0)				0
Issuance of shares pursuant to restricted stock units (in shares)						312,182	296,909
Issuance of shares pursuant to deferred stock units (in shares)					28,308
Shares repurchased and retired (in shares)					(1,177,532)
Balance, end of year (in shares) at Dec. 31, 2018					31,922,409
Balance, beginning of year at Dec. 31, 2017	$ 505,056	$ 268			$ 325			$ 140,749	$ 376,694	$ 268	$ (23,522)	$ 10,810
Issuance of common stock upon stock option exercises	0				0			0
Issuance of shares pursuant to restricted stock units			$ 3	$ 3		$ 3	$ 3
Issuance of shares pursuant to deferred stock units	0				0
Shares repurchased and retired	(25,781)				(12)			(25,769)
Equity-based compensation expense	7,838							7,838
Net income (loss)	3,087								2,928			159
Currency translation adjustment, net	(16,926)										(16,768)	(158)
Investments from non-controlling interest	0											0
Distributions to non-controlling interests	0											0
Sale of non-controlling interests	(3,361)											(3,361)
Balance, end of year at Dec. 31, 2018	$ 470,187	0			$ 319			122,818	379,890	0	(40,290)	7,450
Issuance of common stock upon stock option exercises (in shares)					52,783
Issuance of shares pursuant to restricted stock units (in shares)						237,416	111,158
Issuance of shares pursuant to deferred stock units (in shares)					84,184
Shares repurchased and retired (in shares)					(1,691,991)
Balance, end of year (in shares) at Dec. 31, 2019	30,715,959				30,715,959
Issuance of common stock upon stock option exercises	$ 956				$ 1			955
Issuance of shares pursuant to restricted stock units			2	1		$ 2	$ 1
Issuance of shares pursuant to deferred stock units	1				1
Shares repurchased and retired	(30,393)				(17)			(30,376)
Equity-based compensation expense	7,751							7,751
Net income (loss)	(19,448)								(20,892)			1,444
Currency translation adjustment, net	7,645										7,596	49
Investments from non-controlling interest	0											0
Distributions to non-controlling interests	(1,609)											(1,609)
Sale of non-controlling interests	0											0
Balance, end of year at Dec. 31, 2019	$ 435,093	$ 0			$ 307			101,148	358,998	$ 0	(32,694)	7,334
Issuance of common stock upon stock option exercises (in shares)	52,783				0
Issuance of shares pursuant to restricted stock units (in shares)						297,322	71,541
Issuance of shares pursuant to deferred stock units (in shares)					59,297
Shares repurchased and retired (in shares)					(503,969)
Balance, end of year (in shares) at Dec. 31, 2020	30,640,150				30,640,150
Issuance of common stock upon stock option exercises	$ 0				$ 0			0
Issuance of shares pursuant to restricted stock units			$ 3	$ 1		$ 3	$ 1
Issuance of shares pursuant to deferred stock units	0				0
Shares repurchased and retired	(9,071)				(5)			(9,066)
Equity-based compensation expense	9,919							9,919
Net income (loss)	(30,356)								(31,861)			1,505
Currency translation adjustment, net	2,798										2,847	(49)
Investments from non-controlling interest	131											131
Distributions to non-controlling interests	(153)											(153)
Sale of non-controlling interests	0											0
Balance, end of year at Dec. 31, 2020	$ 408,365				$ 306			$ 102,001	$ 327,137		$ (29,847)	$ 8,768