CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Adjustment for cumulative effect from change in accounting principle (ASU 2016-13)	Common Stock	Additional Paid-In Capital	Retained Earnings	Retained Earnings Adjustment for cumulative effect from change in accounting principle (ASU 2016-13)	Other Cumulative Comprehensive Loss	Treasury Stock and Company Stock Held for Deferred Compensation
Balances (in shares) at Dec. 31, 2018			14,987,962					82,186
Balances at Dec. 31, 2018	$ 134,286		$ 749	$ 80,077	$ 89,291		$ (35,014)	$ (817)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	39,329				39,329
Change in cumulative foreign currency translation adjustment	(1,577)						(1,577)
Shares issued in connection with stock compensation plans (in shares)			121,702					7,502
Shares issued in connection with stock compensation plans	358		$ 7	351
Stock-based compensation	3,756			3,756
Dividends declared	(2,464)				(2,464)
Treasury stock activity (in shares)								(389,645)
Treasury stock activity	(6,612)			14				$ (6,626)
Balances (in shares) at Sep. 30, 2019			15,109,664					464,329
Balances at Sep. 30, 2019	167,076		$ 756	84,198	126,156		(36,591)	$ (7,443)
Balances (in shares) at Dec. 31, 2018			14,987,962					82,186
Balances at Dec. 31, 2018	134,286		$ 749	80,077	89,291		(35,014)	$ (817)
Balances (in shares) at Dec. 31, 2019			15,117,207					464,532
Balances at Dec. 31, 2019	$ 172,141	$ (50)	$ 756	85,639	119,002	$ (50)	(25,803)	$ (7,453)
Increase (Decrease) in Stockholders' Equity
Accounting Standards Update [Extensible List]	us-gaap:AccountingStandardsUpdate201613Member
Balances (in shares) at Jun. 30, 2019			15,107,914					460,823
Balances at Jun. 30, 2019	$ 163,501		$ 756	82,853	121,107		(33,895)	$ (7,320)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	6,915				6,915
Change in cumulative foreign currency translation adjustment	(2,696)						(2,696)
Shares issued in connection with stock compensation plans (in shares)			1,750
Shares issued in connection with stock compensation plans	0
Stock-based compensation	1,345			1,345
Dividends declared	(1,866)				(1,866)
Treasury stock activity (in shares)								(3,506)
Treasury stock activity	(123)							$ (123)
Balances (in shares) at Sep. 30, 2019			15,109,664					464,329
Balances at Sep. 30, 2019	167,076		$ 756	84,198	126,156		(36,591)	$ (7,443)
Balances (in shares) at Dec. 31, 2019			15,117,207					464,532
Balances at Dec. 31, 2019	172,141	$ (50)	$ 756	85,639	119,002	$ (50)	(25,803)	$ (7,453)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(485)				(485)
Change in cumulative foreign currency translation adjustment	518						518
Shares issued in connection with stock compensation plans (in shares)			183,017
Shares issued in connection with stock compensation plans	266		$ 9	257
Stock-based compensation	4,162			4,162
Dividends declared	(1,883)				(1,883)
Treasury stock activity (in shares)								(63,505)
Treasury stock activity	(4,718)			11				$ (4,729)
Balances (in shares) at Sep. 30, 2020			15,300,224					528,037
Balances at Sep. 30, 2020	169,951		$ 765	90,069	116,584		(25,285)	$ (12,182)
Balances (in shares) at Jun. 30, 2020			15,297,291					527,981
Balances at Jun. 30, 2020	170,283		$ 765	88,501	115,576		(26,038)	$ (8,521)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	1,008				1,008
Change in cumulative foreign currency translation adjustment	753						753
Shares issued in connection with stock compensation plans (in shares)			2,933
Shares issued in connection with stock compensation plans	3			3
Stock-based compensation	1,554			1,554
Treasury stock activity (in shares)								(56)
Treasury stock activity	(3,650)			11				$ (3,661)
Balances (in shares) at Sep. 30, 2020			15,300,224					528,037
Balances at Sep. 30, 2020	$ 169,951		$ 765	$ 90,069	$ 116,584		$ (25,285)	$ (12,182)