Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Noncontrolling Interest [Member]	Accumulated Other Comprehensive Loss
Beginning Balance, Issued Shares at Dec. 31, 2018		30,567,725
Beginning Balance, Value at Dec. 31, 2018		$ 3,057	$ 3,397	$ 535,118	$ 66,242	$ (63,377)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2018	$ 544,437
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	54,561			54,561
Net Income (Loss) Attributable to Noncontrolling Interest	(1,172)				(1,172)
Cumulative translation adjustment	7,893					7,893
Repurchase and retirement of common stock, Shares		(50,000)
Repurchase and retirement of common stock, Value	(2,172)	$ (5)	0	(2,167)
Vesting of restricted stock, Shares		12,586
Vesting of restricted stock, Value	0	$ 1	(1)
Share based compensation	1,422		1,422
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested, Shares		(471)
Forfeiture of certain shares to satisfy exercise costs and the recipients' income tax obligations related to stock options exercised and restricted stock vested	(27)	$ 0	(27)
Recognized controlling ownership of joint venture	(12,790)		398		(13,188)
Dividends paid	(4,599)			(4,599)	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jun. 30, 2019	587,553
Ending Balance, Issued Shares at Jun. 30, 2019		30,529,840
Ending Balance, Value at Jun. 30, 2019		$ 3,053	5,189	582,913	51,882	(55,484)
Beginning Balance, Issued Shares at Mar. 31, 2019		30,523,756
Beginning Balance, Value at Mar. 31, 2019		$ 3,052	4,350	556,364	65,177	(59,895)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2019	569,048
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	28,851			28,851
Net Income (Loss) Attributable to Noncontrolling Interest	(505)				(505)
Cumulative translation adjustment	4,411					4,411
Vesting of restricted stock, Shares		6,204
Vesting of restricted stock, Value	0	$ 1	(1)
Share based compensation	846		846
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested, Shares		(120)
Forfeiture of certain shares to satisfy exercise costs and the recipients' income tax obligations related to stock options exercised and restricted stock vested	(6)	$ 0	(6)
Recognized controlling ownership of joint venture	(12,790)		0		(12,790)
Dividends paid	(2,302)			(2,302)	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jun. 30, 2019	$ 587,553
Ending Balance, Issued Shares at Jun. 30, 2019		30,529,840
Ending Balance, Value at Jun. 30, 2019		$ 3,053	5,189	582,913	51,882	(55,484)
Beginning Balance, Issued Shares at Dec. 31, 2019	30,492,044	30,492,044
Beginning Balance, Value at Dec. 31, 2019	$ 550,114	$ 3,049	6,960	618,503	49,331	(78,398)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Dec. 31, 2019	599,445
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	48,198			48,198
Net Income (Loss) Attributable to Noncontrolling Interest	(489)				(489)
Cumulative translation adjustment	(54,071)					(54,071)
Vesting of restricted stock, Shares		41,385
Vesting of restricted stock, Value	0	$ 4	(4)
Share based compensation	2,253		2,253
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested, Shares		(55,526)
Forfeiture of certain shares to satisfy exercise costs and the recipients' income tax obligations related to stock options exercised and restricted stock vested	(1,841)	$ (5)	(507)	(1,329)
Dividends paid	(4,605)			(4,605)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jun. 30, 2020	$ 589,526
Ending Balance, Issued Shares at Jun. 30, 2020	30,507,903	30,507,903
Ending Balance, Value at Jun. 30, 2020	$ 540,684	$ 3,051	9,335	660,767	48,842	(132,469)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		30,000
Stock Issued During Period, Value, Stock Options Exercised	636	$ 3	633
Beginning Balance, Issued Shares at Mar. 31, 2020		30,475,994
Beginning Balance, Value at Mar. 31, 2020		$ 3,048	8,211	639,596	49,053	(128,192)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2020	571,716
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss) Attributable to Parent	23,475			23,475
Net Income (Loss) Attributable to Noncontrolling Interest	(211)				(211)
Cumulative translation adjustment	(4,277)					(4,277)
Vesting of restricted stock, Shares		31,909
Vesting of restricted stock, Value	0	$ 3	(3)
Share based compensation	1,127		1,127
Dividends paid	(2,304)			(2,304)	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Jun. 30, 2020	$ 589,526
Ending Balance, Issued Shares at Jun. 30, 2020	30,507,903	30,507,903
Ending Balance, Value at Jun. 30, 2020	$ 540,684	$ 3,051	$ 9,335	$ 660,767	$ 48,842	$ (132,469)