CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Additional Paid In Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Treasury Stock	Accumulated  Other Comprehensive Loss
BEGINNING BALANCE (in shares) at Dec. 31, 2019			32,871,504
BEGINNING BALANCE at Dec. 31, 2019	$ 250,031	$ (1,190)	$ 329	$ 190,230	$ 173,371	$ (1,190)		$ (7,143)
BEGINING BALANCE, Treasury Stock (in shares) at Dec. 31, 2019							(2,855,164)
BEGINING BALANCE, Treasury Stock at Dec. 31, 2019							$ (106,756)
Net income	15,988				15,988
Issuance of common stock awards to employees (in shares)			89,957
Issuance of common stock awards to employees	0		$ 1	(1)
Surrender of common stock awards (in shares)							(1,759)
Surrender of common stock awards	0						$ 0
Share-based compensation expense	2,302			2,302
Share-based compensation issued to directors (in shares)			316
Share-based compensation issued to directors	33			33
Common stock repurchase (in shares)							(442,542)
Common stock repurchase	(15,759)						$ (15,759)
Other comprehensive income (loss), net of tax	(5,608)							(5,608)
ENDING BALANCE (in shares) at Mar. 31, 2020			32,961,777
ENDING BALANCE at Mar. 31, 2020	$ 245,797		$ 330	192,564	188,169			(12,751)
ENDING BALANCE, Treasury Stock (in shares) at Mar. 31, 2020							(3,299,465)
ENDING BALANCE, Treasury Stock at Mar. 31, 2020							$ (122,515)
BEGINNING BALANCE (in shares) at Dec. 31, 2020	33,141,879		33,141,879
BEGINNING BALANCE at Dec. 31, 2020	$ 319,182		$ 331	199,847	269,420			(8,763)
BEGINING BALANCE, Treasury Stock (in shares) at Dec. 31, 2020	(3,518,607)						(3,518,607)
BEGINING BALANCE, Treasury Stock at Dec. 31, 2020	$ (141,653)						$ (141,653)
Net income	17,291				17,291
Issuance of common stock awards to employees (in shares)			66,203
Issuance of common stock awards to employees	0		$ 0
Surrender of common stock awards (in shares)							(274)
Surrender of common stock awards	0						$ 0
Share-based compensation expense	2,713			2,713
Share-based compensation issued to directors	102			102
Dividends declared ($0.30 per share)	(8,907)				(8,907)
Other comprehensive income (loss), net of tax	$ 10,157							10,157
ENDING BALANCE (in shares) at Mar. 31, 2021	33,208,082		33,208,082
ENDING BALANCE at Mar. 31, 2021	$ 340,538		$ 331	$ 202,662	$ 277,804			$ 1,394
ENDING BALANCE, Treasury Stock (in shares) at Mar. 31, 2021	(3,518,881)						(3,518,881)
ENDING BALANCE, Treasury Stock at Mar. 31, 2021	$ (141,653)						$ (141,653)