Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 259,263	$ 37,458
Other current assets	3,685	3,483
Total current assets	262,948	40,941
Investments in affiliates	24,117	107,950
Deferred tax assets	101,567	115,285
Other assets	365	55
Total assets	388,997	264,231
Current liabilities:
Accrued employment costs	2,026	2,356
Income taxes payable	43,110
Other current liabilities	2,298	3,772
Total current liabilities	47,434	6,128
Pension and other postretirement liabilities	16,857	18,433
Long-term liabilities	71,050	69,259
Total liabilities	135,341	93,820
Commitments and contingencies
Shareholders' Equity:
Preferred stock, 0.01 par value; 10,000,000 shares authorized, no shares issued and outstanding
Common Stock:
Paid-in capital	1,019,988	1,019,988
Accumulated deficit	(728,000)	(826,460)
Accumulated other comprehensive loss	(29,051)	(13,836)
Total shareholders' equity	253,656	170,411
Total liabilities and shareholders' equity	388,997	264,231
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