Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 50,301	$ 55,313
Accounts receivable (net of allowance of $844 and $581 at March 31, 2019 and December 31, 2018, respectively)	19,552	22,057
Inventories	3,877	3,912
Prepaids and other current assets	6,367	5,023
Assets held for sale	1,089	1,089
Total current assets	81,186	87,394
Property, plant and equipment, at cost	423,015	422,966
Less accumulated depreciation	(399,091)	(396,705)
Property, plant and equipment, net	23,924	26,261
Operating lease right-of-use assets	22,527
Intangible assets, net	228	304
Goodwill
Deferred income taxes, net	4,358	3,572
Other assets	4,028	5,029
Total assets	136,251	122,560
Current liabilities:
Accounts payable	4,725	6,334
Accrued compensation and benefits	5,625	8,294
Other accrued expense	6,297	5,586
Advance subscription payments	12,153	11,449
Total current liabilities	28,800	31,663
Long-term pension liabilities	30,997	31,889
Long-term operating lease liabilities	23,862
Other post-employment benefits	1,162	1,165
Other liabilities	4,764	7,045
Total liabilities	89,585	71,762
Shareholders' equity:
Preferred stock, $.01 par value; Authorized 2,000,000 shares; none issued
Treasury stock, Series A, at cost; 1,780,899 and 1,697,370 shares held at March 31, 2019 and December 31, 2018, respectively	(12,941)	(12,601)
Additional paid-in capital	494,389	494,389
Accumulated other comprehensive loss	(37,578)	(37,641)
Accumulated deficit	(397,437)	(393,582)
Total shareholders’ equity	46,666	50,798
Total liabilities and shareholders’ equity	136,251	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