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
Common Stock, Dividends, Per Share, Cash Paid	$ 0.225
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	25,710			25,710
Net Income (Loss) Attributable to Noncontrolling Interest	(667)				(667)
Cumulative translation adjustment	3,482					3,482
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		6,382
Vesting of restricted stock, Value	0	$ 0	0
Share based compensation	576		576
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested, Shares		(351)
Forfeiture of certain shares to satisfy exercise costs and the recipients income tax obligations related to stock options exercised and restricted stock vested	(21)	$ 0	(21)
Recognized controlling ownership of joint venture	0		398		(398)
Dividends paid	(2,297)			(2,297)	0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2019	$ 569,048
Ending Balance, Issued Shares at Mar. 31, 2019		30,523,756
Ending Balance, Value at Mar. 31, 2019		$ 3,052	4,350	556,364	65,177	(59,895)
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	24,723			24,723
Net Income (Loss) Attributable to Noncontrolling Interest	(278)				(278)
Cumulative translation adjustment	(49,794)					(49,794)
Vesting of restricted stock, Shares		9,476
Vesting of restricted stock, Value	0	$ 1	(1)
Share based compensation	1,126		1,126
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	(2,301)			(2,301)
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest at Mar. 31, 2020	$ 571,716
Ending Balance, Issued Shares at Mar. 31, 2020	30,475,994	30,475,994
Ending Balance, Value at Mar. 31, 2020	$ 522,663	$ 3,048	8,211	$ 639,596	$ 49,053	$ (128,192)
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