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Consolidated Statements of Changes in Stockholders' Deficit - USD ($) $ in Thousands	Cumulative Effect, Period of Adoption, Adjustment [Member] Preferred Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Common Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Additional Paid-in Capital [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Retained Earnings [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] Treasury Stock [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member] AOCI Attributable to Parent [Member]	Cumulative Effect, Period of Adoption, Adjustment [Member]	Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Treasury Stock [Member]	AOCI Attributable to Parent [Member]	Total
Balance at Dec. 31, 2018				$ 11,377		$ (11,355)	$ 22	$ 9,723	$ 12,115	$ 453,868	$ 812,704	$ (1,251,388)	$ (46,483)	$ (19,184)
Exercise of stock options and release of unvested shares									6	(12)				(6)
Stock-based compensation										1,030				1,030
Treasury stock issued										(7,864)		7,879		15
Net income (loss)											(26,264)			(26,264)
Other comprehensive loss													(5,296)	(5,296)
Balance at Dec. 31, 2019								9,723	12,121	447,022	797,817	(1,243,509)	(63,134)	(49,683)
Stock-based compensation										753				753
Treasury stock issued										(64,732)		64,710		(22)
Net income (loss)											(1,694)			(1,694)
Other comprehensive loss													(2,477)	(2,477)
Balance at Dec. 31, 2020								$ 9,723	$ 12,121	$ 383,043	$ 796,123	$ (1,178,799)	$ (65,611)	$ (53,123)

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Amount after tax, excluding reclassification from AOCI to retained earnings due to "Tax Cuts and Jobs Act of 2017", of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.

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