Consolidated Statements of Equity (Unaudited) - USD ($) $ in Thousands	Total	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]	AOCI Attributable to Parent [Member]	Noncontrolling Interest [Member]
Balance, beginning of period (in shares) at Dec. 31, 2018				31,922,409
Issuance of common stock upon stock option exercises (in shares)				52,783
Issuance of shares pursuant to restricted stock units (in shares)					222,745	111,158
Issuance of shares pursuant to deferred stock units (in shares)				84,184
Shares repurchased and retired (in shares)				(1,585,731)
Balance, end of period (in shares) at Sep. 30, 2019				30,807,548
Balance, beginning of period at Dec. 31, 2018	$ 470,187			$ 319			$ 122,818	$ 379,890	$ (40,290)	$ 7,450
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	(28,143)			(16)			(28,127)
Balance, end of period at Sep. 30, 2019	438,444			$ 308			101,627	373,559	(43,626)	6,576
Equity-based compensation expense	5,981						5,981
Net income (loss)	(5,789)							(6,331)		542
Currency translation adjustment, net	(3,343)								(3,336)	(7)
Distributions to non-controlling interests	(1,409)									(1,409)
Balance, beginning of period (in shares) at Jun. 30, 2019				30,941,394
Issuance of common stock upon stock option exercises (in shares)				0
Issuance of shares pursuant to restricted stock units (in shares)					17,471	0
Issuance of shares pursuant to deferred stock units (in shares)				6,698
Shares repurchased and retired (in shares)				(158,015)
Balance, end of period (in shares) at Sep. 30, 2019				30,807,548
Balance, beginning of period at Jun. 30, 2019	434,023			$ 309			102,841	367,523	(42,940)	6,290
Issuance of common stock upon stock option exercises	0			0			0
Issuance of shares pursuant to restricted stock units		0	0		$ 0	$ 0
Issuance of shares pursuant to deferred stock units	0			0
Shares repurchased and retired	(2,972)			(1)			(2,971)
Balance, end of period at Sep. 30, 2019	438,444			$ 308			101,627	373,559	(43,626)	6,576
Equity-based compensation expense	1,757						1,757
Net income (loss)	6,349							6,036		313
Currency translation adjustment, net	(713)								(686)	(27)
Distributions to non-controlling interests	$ 0									0
Balance, beginning of period (in shares) at Dec. 31, 2019	30,715,959			30,715,959
Issuance of common stock upon stock option exercises (in shares)				0
Issuance of shares pursuant to restricted stock units (in shares)					198,433	71,541
Issuance of shares pursuant to deferred stock units (in shares)				58,267
Shares repurchased and retired (in shares)				(273,877)
Balance, end of period (in shares) at Sep. 30, 2020	30,770,323			30,770,323
Balance, beginning of period at Dec. 31, 2019	$ 435,093			$ 307			101,148	358,998	(32,694)	7,334
Issuance of common stock upon stock option exercises	0			0			0
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	(5,255)			(3)			(5,252)
Balance, end of period at Sep. 30, 2020	407,695			$ 308			103,977	332,748	(37,426)	8,088
Equity-based compensation expense	8,081						8,081
Net income (loss)	(25,201)							(26,250)		1,049
Currency translation adjustment, net	(4,874)								(4,732)	(142)
Distributions to non-controlling interests	$ (153)									(153)
Balance, beginning of period (in shares) at Jun. 30, 2020				30,768,399
Issuance of common stock upon stock option exercises (in shares)				0
Issuance of shares pursuant to restricted stock units (in shares)					9,888	0
Issuance of shares pursuant to deferred stock units (in shares)				1,685
Shares repurchased and retired (in shares)				(9,649)
Balance, end of period (in shares) at Sep. 30, 2020	30,770,323			30,770,323
Balance, beginning of period at Jun. 30, 2020	$ 429,618			$ 308			100,490	361,222	(39,962)	7,560
Issuance of common stock upon stock option exercises	0			0			0
Issuance of shares pursuant to restricted stock units		$ 0	$ 0		$ 0	$ 0
Issuance of shares pursuant to deferred stock units	0			0
Shares repurchased and retired	(151)			0			(151)
Balance, end of period at Sep. 30, 2020	407,695			$ 308			103,977	332,748	(37,426)	8,088
Equity-based compensation expense	3,638						$ 3,638
Net income (loss)	(27,894)							$ (28,474)		580
Currency translation adjustment, net	2,484								$ 2,536	(52)
Distributions to non-controlling interests	$ 0									$ 0