CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Director [Member]	Common stock	Common stock Director [Member]	Additional Paid-in Capital	Additional Paid-in Capital Director [Member]	Retained Earnings	Treasury Stock
Beginning balance, shares outstanding at Dec. 31, 2018			18,078
Beginning Balance at Dec. 31, 2018	$ 221,492		$ 257		$ 243,849		$ 71,680	$ (94,294)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	11,964						11,964
Isuuance of common stock, shares			58
Issuance of common stock	684		$ 1		683
Exercise of stock options, shares			71
Exercise of stock options	472		$ 1		471
Issuance of restricted common stock, shares			25
Issuance of restricted common stock	0
Cancellation and retirement of restricted common stock, shares			(21)
Cancellation and retirement of restricted common stock and stock options	(195)				(195)
Stock-based compensation expense	1,616				1,616
Dividends on common stock	(4,061)				(4,061)
Treasury stock acquired, shares			(400)
Treasury stock acquired	(7,756)							(7,756)
Other, shares			15
Other	294		$ 294
Ending balance, shares outstanding at Sep. 30, 2019			17,826
Ending Balance at Sep. 30, 2019	224,510		$ 259		242,657		83,644	(102,050)
Beginning balance, shares outstanding at Jun. 30, 2019			17,812
Beginning Balance at Jun. 30, 2019	224,560		$ 258		243,285		83,067	(102,050)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	577						577
Isuuance of common stock, shares			18
Issuance of common stock	212		$ 1		211
Cancellation and retirement of restricted common stock, shares			(4)
Cancellation and retirement of restricted common stock and stock options	(16)				(16)
Stock-based compensation expense	513				513
Dividends on common stock	(1,336)				(1,336)
Ending balance, shares outstanding at Sep. 30, 2019			17,826
Ending Balance at Sep. 30, 2019	224,510		$ 259		242,657		83,644	(102,050)
Beginning balance, shares outstanding at Dec. 31, 2019			17,855
Beginning Balance at Dec. 31, 2019	226,569		$ 259		242,147		86,213	(102,050)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	7,725						7,725
Isuuance of common stock, shares			60	26
Issuance of common stock	921	$ 491	$ 1		920	$ 491
Exercise of stock options, shares			12
Exercise of stock options	(31)				(31)
Issuance of restricted common stock, shares			10
Issuance of restricted common stock	0
Cancellation and retirement of restricted common stock, shares			(11)
Cancellation and retirement of restricted common stock and stock options	(250)				(250)
Stock-based compensation expense	1,982				1,982
Dividends on common stock	(4,251)				(4,251)
Convertible notes repurchase	(828)				(828)
Other, shares			18
Other	468				468
Ending balance, shares outstanding at Sep. 30, 2020			17,970
Ending Balance at Sep. 30, 2020	232,796		$ 260		240,648		93,938	(102,050)
Beginning balance, shares outstanding at Jun. 30, 2020			17,934
Beginning Balance at Jun. 30, 2020	228,491		$ 260		241,868		88,413	(102,050)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income (Loss)	5,525						5,525
Isuuance of common stock, shares			16	9
Issuance of common stock	297	$ 197			297	$ 197
Exercise of stock options, shares			12
Exercise of stock options	(31)				(31)
Cancellation and retirement of restricted common stock, shares			(1)
Cancellation and retirement of restricted common stock and stock options	(16)				(16)
Stock-based compensation expense	730				730
Dividends on common stock	(1,569)				(1,569)
Convertible notes repurchase	(828)				(828)
Ending balance, shares outstanding at Sep. 30, 2020			17,970
Ending Balance at Sep. 30, 2020	$ 232,796		$ 260		$ 240,648		$ 93,938	$ (102,050)