Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 81,626	$ 259,067
Income tax refund receivable	1,188	576
Other current assets	1,265	1,322
Total current assets	84,079	260,965
Right-of-use asset	671	988
Income tax refund receivable, non-current	0	387
Investments in affiliates	63,234	90,184
Deferred tax assets	38,105	37,945
Other assets	340	341
Total assets	186,429	390,810
Current liabilities:
Accrued employment costs	1,802	2,611
Other current liabilities	2,474	2,883
Total current liabilities	4,276	5,494
Pension and other postretirement liabilities	16,499	17,447
Other liabilities	19,423	17,842
Total liabilities	40,198	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	(823,673)	(605,766)
Accumulated other comprehensive loss	(40,803)	(54,914)
Total shareholders' equity	146,231	350,027
Total liabilities and shareholders' equity	186,429	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)
Non-Voting Common Stock [Member]
Common Stock:
Common stock, 0.01 par value	$ 95	$ 95