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, 2017		$ 1,050,800	$ (1,027,500)	$ (18,900)	$ (26,600)	$ (4,700)	$ (26,900)
Balance, shares at Dec. 31, 2017	28,097				2,820
Net income			4,100			4,700	4,100
Purchase of treasury stock					$ 0		0
Purchase of treasury stock, shares					69
Restricted stock grants and other		(1,900)			$ 1,900
Restricted stock grants and other, shares					(487)
Net change in cumulative translation adjustment				700			700
Pension adjustments, net of tax				(2,500)			(2,500)
ASC 606 Adjustment			300				300
Reclassification adjustment			200				200
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			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		4,700				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