Consolidated Statements of Shareholders' Equity - USD ($) $ in Thousands	Common Stock [Member] Series A	Common Stock [Member] Series B	Common Stock [Member]	Additional Paid-in Capital [Member]	Treasury Stock Series A	Treasury Stock	Accumulated Other Comprehensive Loss [Member]	Accumulated Deficit [Member]	Series A	Total
Beginning Balance at Dec. 31, 2017			$ 232	$ 494,989		$ (11,302)	$ (24,932)	$ (361,288)		$ 97,699
Beginning Balance, Shares Common Stock at Dec. 31, 2017	20,700,292	2,469,755
Beginning Balance, Treasury Stock at Dec. 31, 2017					(1,430,961)
Net income (loss)								(25,221)		(25,221)
Other comprehensive income (loss)							(12,709)			(12,709)
Shares repurchased, shares					(266,409)				(266,409)
Shares repurchased						(1,299)			$ (1,299)	(1,299)
Issuance of shares for restricted stock units, shares	151,236
Issuance of shares for restricted stock units			1	(1)
Issuance of shares for stock option exercises, shares	3,000
Issuance of shares for stock option exercises				6						6
Share-based compensation				(605)						(605)
Conversion of Series B to Series A, shares	200	(200)
Dividends declared								(7,073)		(7,073)
Ending Balance at Dec. 31, 2018			233	494,389		(12,601)	(37,641)	(393,582)		50,798
Ending Balance, Shares Common Stock at Dec. 31, 2018	20,854,728	2,469,555
Ending Balance, Shares Treasury Stock at Dec. 31, 2018					(1,697,370)
Net income (loss)								9,292		9,292
Other comprehensive income (loss)							5,347			5,347
Shares repurchased, shares					(216,490)				(216,490)
Shares repurchased						(842)			$ (842)	(842)
Conversion of Series B to Series A, shares	247	(247)
Dividends declared								(6,858)		(6,858)
Ending Balance at Dec. 31, 2019			$ 233	$ 494,389		$ (13,443)	$ (32,294)	$ (391,148)		$ 57,737
Ending Balance, Shares Common Stock at Dec. 31, 2019	20,854,975	2,469,308
Ending Balance, Shares Treasury Stock at Dec. 31, 2019					(1,913,860)