Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 37,458	$ 58,853
Other current assets	3,483	2,979
Total current assets	40,941	61,832
Investments in affiliates	107,950
Deferred tax assets	115,285	152,676
Other assets	55	110
Total assets	264,231	214,618
Current liabilities:
Accrued employment costs	2,356	2,376
Other current liabilities	3,772	12,055
Total current liabilities	6,128	14,431
Pension and other postretirement liabilities	18,433	18,119
Long-term liabilities	69,259	73,578
Total liabilities	93,820	106,128
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	1,020,129
Treasury stock (at cost), 154,494 shares of voting common stock	(9,592)	(9,592)
Accumulated deficit	(826,460)	(873,660)
Accumulated other comprehensive loss	(13,836)	(28,698)
Total shareholders' equity	170,411	108,490
Total liabilities and shareholders' equity	264,231	214,618
Voting Common Stock [Member]
Common Stock:
Common stock, 0.01 par value	216	216
Nonvoting Common Stock [Member]
Common Stock:
Common stock, 0.01 par value	$ 95	$ 95