Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 23,231	$ 31,631
Income tax refund receivable	1,226	1,228
Other current assets	1,654	1,232
Total current assets	26,111	34,091
Right-of-use asset	315	342
Investments in affiliates	248,371	192,664
Deferred tax assets	28,236	27,339
Other assets	33	33
Total assets	303,066	254,469
Current liabilities:
Accrued employment costs	2,003	2,839
Other current liabilities	2,915	2,002
Total current liabilities	4,918	4,841
Pension and other post-retirement liabilities	19,599	20,181
Other liabilities	20,410	19,914
Total liabilities	44,927	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	(676,995)	(729,202)
Accumulated other comprehensive loss	(75,573)	(71,972)
Total shareholders' equity	258,139	209,533
Total liabilities and shareholders' equity	303,066	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