Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 25,460	$ 31,631
Income tax refund receivable	1,228	1,228
Other current assets	1,801	1,232
Total current assets	28,489	34,091
Right-of-use asset	469	342
Investments in affiliates	225,133	192,664
Deferred tax assets	27,819	27,339
Other assets	34	33
Total assets	281,944	254,469
Current liabilities:
Accrued employment costs	1,379	2,839
Other current liabilities	2,180	2,002
Total current liabilities	3,559	4,841
Pension and other post-retirement liabilities	19,793	20,181
Other liabilities	20,159	19,914
Total liabilities	43,511	44,936
Commitments and contingencies
Shareholders' Equity:
Preferred stock, $0.01 par value	0	0
Common Stock:
Paid-in capital	1,019,988	1,019,988
Accumulated deficit	(698,486)	(729,202)
Accumulated other comprehensive loss	(73,788)	(71,972)
Total shareholders' equity	238,433	209,533
Total liabilities and shareholders' equity	281,944	254,469
Voting Common Stock [Member]
Common Stock:
Common stock, $0.01 par value	216	216
Treasury stock (at cost), 154,494 shares of voting common stock	(9,592)	(9,592)
Nonvoting Common Stock [Member]
Common Stock:
Common stock, $0.01 par value	95	95
Series A Preferred Stock [Member]
Shareholders' Equity:
Preferred stock, $0.01 par value	0	0
Series B Preferred Stock [Member]
Shareholders' Equity:
Preferred stock, $0.01 par value	$ 0	$ 0