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]	Noncontrolling Interest [Member]	Total
Balance at Dec. 31, 2016		$ 1,042,800	$ (1,019,100)	$ (20,600)	$ (28,400)		$ (25,300)
Balance, shares at Dec. 31, 2016	4,437,789				744,091
Net loss			(8,400)			(10,200)	(18,600)
Purchase of treasury stock					$ (100)		$ (100)
Purchase of treasury stock, shares					27,950		27,950
Restricted stock grants and other		(1,800)			$ 1,900		$ 100
Restricted stock grants and other, shares					(138,102)		(138,102)
Issuance of stock for Capacity and Services Transaction with Clinton	$ 100	10,100					$ 10,200
Issuance of stock for Capacity and Services Transaction with Clinton, shares	1,250,000
Contingent consideration in shares		(200)					(200)
Net change in cumulative translation adjustment				300			300
Pension adjustments, net of tax				1,400			1,400
Contribution from non-controlling interest						5,600	5,600
Reclassification adjustment						(100)	(100)
Balance at Dec. 31, 2017	$ 100	1,050,900	(1,027,500)	(18,900)	$ (26,600)	(4,700)	(26,700)
Balance, shares at Dec. 31, 2017	5,687,789				633,939
Net loss			4,100			4,700	4,100
Purchase of treasury stock
Purchase of treasury stock, shares					13,879		13,879
Restricted stock grants and other		(1,900)			$ 1,900
Restricted stock grants and other, shares					(97,516)		(97,516)
Issuance of stock for Capacity and Services Transaction with Clinton
Net change in cumulative translation adjustment				700			700
Pension adjustments, net of tax				(2,500)			(2,500)
Reclassification adjustment			200				200
ASC 606 Adjustment			300				300
Balance at Dec. 31, 2018	$ 100	$ 1,049,000	$ (1,022,900)	$ (20,700)	$ (24,700)		$ (19,200)
Balance, shares at Dec. 31, 2018	5,687,789				550,302