Consolidated Statements of Shareholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock [Member]	Non-controlling Interest [Member]	Total
Balance at Dec. 31, 2018		$ 1,048,900	$ (1,022,900)	$ (20,700)	$ (24,700)		$ (19,400)
Balance, shares at Dec. 31, 2018	28,097				2,402
Net income (loss)			20,200			2,900	23,100
Purchase of treasury stock
Purchase of treasury stock, shares					450
Restricted stock grants and other		200			$ (200)
Restricted stock grants and other, shares					75
Pension adjustments, net of tax				100			100
Recognition of noncontrolling interest		4,800				22,700	27,500
Balance at Dec. 31, 2019		1,053,900	(1,002,700)	(20,600)	$ (24,900)	25,600	31,300
Balance, shares at Dec. 31, 2019	28,097				2,927
Net income (loss)			(62,300)			(1,300)	(63,600)
Acquisition of noncontrolling interest of Adara Enterprises, Corp.		(3,000)				(1,600)	(4,600)
Disposition of Adara Asset Management to a related party		8,700					8,700
Pension adjustments, net of tax				20,600			20,600
Balance at Dec. 31, 2020		$ 1,059,600	$ (1,065,000)		$ (24,900)	$ 22,700	$ (7,600)
Balance, shares at Dec. 31, 2020	28,097				2,927