Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 83,386	$ 259,067
Income tax refund receivable	1,235	576
Other current assets	1,470	1,322
Total current assets	86,091	260,965
Right-of-use asset	508	988
Income tax refund receivable, non-current	0	387
Investments in affiliates	105,402	90,184
Deferred tax assets	37,994	37,945
Other assets	34	341
Total assets	230,029	390,810
Current liabilities:
Accrued employment costs	2,361	2,611
Other current liabilities	2,204	2,883
Total current liabilities	4,565	5,494
Pension and other post-retirement liabilities	15,614	17,447
Other liabilities	19,667	17,842
Total liabilities	39,846	40,783
Commitments and contingencies
Shareholders' Equity:
Preferred stock, $0.01 par value; 10,000,000 shares authorized, no shares issued and outstanding	0	0
Common Stock:
Paid-in capital	1,019,988	1,019,988
Accumulated deficit	(772,501)	(605,766)
Accumulated other comprehensive loss	(48,023)	(54,914)
Total shareholders' equity	190,183	350,027
Total liabilities and shareholders' equity	230,029	390,810
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)
Total shareholders' equity	216	216
Nonvoting Common Stock [Member]
Common Stock:
Common stock, $0.01 par value	95	95
Total shareholders' equity	$ 95	$ 95