Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Treasury Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance, shares at Dec. 31, 2018		(24,418,252)	(2,671,962)
Beginning Balance at Dec. 31, 2018	$ 540,624	$ 244	$ (124,794)	$ 452,573	$ 196,106	$ 16,495
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	19,456				13,776	5,680
Issuance of common stock in connection with:
Restricted stock awards, net of cancellations, shares		272,941	25,174
Restricted stock awards, net of cancellations	0	$ 3	$ 2,121	(2,124)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		20,000
Stock Issued During Period, Value, Stock Options Exercised	468	$ 0		468
Share-based compensation	12,273			12,273
Shares redeemed for employee tax withholdings, shares			(96,038)
Shares redeemed for employee tax withholdings	(4,460)		$ 4,460
Ending Balance, shares at Jun. 30, 2019		(24,711,193)	(2,742,826)
Ending Balance at Jun. 30, 2019	568,361	$ 247	$ (127,133)	463,190	209,882	22,175
Beginning Balance, shares at Mar. 31, 2019		(24,682,802)	(2,738,850)
Beginning Balance at Mar. 31, 2019	549,653	$ 247	$ (126,983)	457,748	199,410	19,231
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	13,416				10,472	2,944
Issuance of common stock in connection with:
Restricted stock awards, net of cancellations, shares		18,391	(2,438)
Restricted stock awards, net of cancellations	0	$ 0	$ (75)	75
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		10,000
Stock Issued During Period, Value, Stock Options Exercised	234	$ 0		234
Share-based compensation	5,133			5,133
Shares redeemed for employee tax withholdings, shares			(1,538)
Shares redeemed for employee tax withholdings	(75)		$ 75
Ending Balance, shares at Jun. 30, 2019		(24,711,193)	(2,742,826)
Ending Balance at Jun. 30, 2019	568,361	$ 247	$ (127,133)	463,190	209,882	22,175
Beginning Balance, shares at Dec. 31, 2019		(24,603,308)	(2,763,302)
Beginning Balance at Dec. 31, 2019	$ 585,465	$ 247	$ (128,348)	460,781	237,849	14,936
Issuance of common stock in connection with:
Stock Repurchased and Retired During Period, Shares	(313,998)
Stock Repurchased and Retired During Period, Value	$ (20,900)
Ending Balance, shares at Mar. 31, 2020		(24,559,854)	(2,780,835)
Ending Balance at Mar. 31, 2020	524,609	$ 246	$ (128,366)	444,974	195,541	12,214
Beginning Balance, shares at Dec. 31, 2019		(24,603,308)	(2,763,302)
Beginning Balance at Dec. 31, 2019	585,465	$ 247	$ (128,348)	460,781	237,849	14,936
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	(38,762)				(28,761)	(10,001)
Issuance of common stock in connection with:
Restricted stock awards, net of cancellations, shares		270,126	98,310
Restricted stock awards, net of cancellations	0	$ 2	$ 6,919	(6,921)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		26,800
Stock Issued During Period, Value, Stock Options Exercised	646	$ 0		646
Share-based compensation	16,763			16,763
Shares redeemed for employee tax withholdings, shares			(121,806)
Shares redeemed for employee tax withholdings	(7,217)		$ 7,217
Stock Repurchased and Retired During Period, Shares		(313,998)
Stock Repurchased and Retired During Period, Value	(20,881)	$ (3)		(20,878)
Ending Balance, shares at Jun. 30, 2020		(24,586,236)	(2,786,798)
Ending Balance at Jun. 30, 2020	536,014	$ 246	$ (128,646)	450,391	209,088	4,935
Beginning Balance, shares at Mar. 31, 2020		(24,559,854)	(2,780,835)
Beginning Balance at Mar. 31, 2020	524,609	$ 246	$ (128,366)	444,974	195,541	12,214
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Comprehensive income (loss)	6,268				13,547	(7,279)
Issuance of common stock in connection with:
Restricted stock awards, net of cancellations, shares		19,582	(4,157)
Restricted stock awards, net of cancellations	0	$ 0	$ (196)	196
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period		6,800
Stock Issued During Period, Value, Stock Options Exercised	178	$ 0		178
Share-based compensation	5,043			5,043
Shares redeemed for employee tax withholdings, shares			(1,806)
Shares redeemed for employee tax withholdings	(84)		$ 84
Ending Balance, shares at Jun. 30, 2020		(24,586,236)	(2,786,798)
Ending Balance at Jun. 30, 2020	$ 536,014	$ 246	$ (128,646)	$ 450,391	$ 209,088	$ 4,935