Condensed Consolidated Statements of Shareholders' Equity (Deficit) (Unaudited) - USD ($) shares in Thousands, $ 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			9,600				9,600
Pension adjustments, net of tax				100			100
Balance at Mar. 31, 2019		1,048,900	(1,013,300)	(20,600)	$ (24,700)		(9,700)
Balance, shares at Mar. 31, 2019	28,097				2,402
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			(12,800)			(400)	(13,200)
Pension adjustments, net of tax				20,600			20,600
Balance at Mar. 31, 2020		$ 1,053,900	$ (1,015,500)		$ (24,900)	$ 25,200	$ 38,700
Balance, shares at Mar. 31, 2020	28,097				2,927