Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 48,626	$ 55,313
Accounts receivable (net of allowance of $671 and $581 at December 31, 2019 and December 31, 2018, respectively)	18,441	22,057
Inventories	2,573	3,912
Prepaids and other current assets	5,164	5,023
Assets held for sale		1,089
Total current assets	74,804	87,394
Property, plant and equipment, at cost	343,893	422,966
Less accumulated depreciation	(325,440)	(396,705)
Property, plant and equipment, net	18,453	26,261
Operating lease right-of-use assets	21,371
Intangible assets, net	319	304
Deferred income taxes, net	50	3,572
Long-term note receivable	22,400
Other assets	3,648	5,029
Total assets	141,045	122,560
Current liabilities:
Accounts payable	6,103	6,334
Accrued compensation and benefits	7,407	8,294
Other accrued expense	5,930	5,586
Contract liabilities	12,098	11,449
Total current liabilities	31,538	31,663
Long-term pension liabilities	23,039	31,889
Long-term operating lease liabilities	23,120
Other post-employment benefits	1,347	1,165
Other liabilities	4,264	7,045
Total liabilities	83,308	71,762
Shareholders' equity:
Preferred stock, $.01 par value; Authorized 2,000,000 shares; none issued
Treasury stock, Series A, at cost; 1,913,860 and 1,697,370 shares held at December 31, 2019 and December 31, 2018, respectively	(13,443)	(12,601)
Additional paid-in capital	494,389	494,389
Accumulated other comprehensive loss	(32,294)	(37,641)
Accumulated deficit	(391,148)	(393,582)
Total shareholders’ equity	57,737	50,798
Total liabilities and shareholders’ equity	141,045	122,560
Series A
Shareholders' equity:
Common stock, $.01 par value; Authorized 125,000,000 shares	209	209
Series B
Shareholders' equity:
Common stock, $.01 par value; Authorized 125,000,000 shares	$ 24	$ 24