Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 51,670	$ 58,853
Other current assets	3,804	2,979
Total current assets	55,474	61,832
Investments in affiliates	60,942
Long-term deferred tax assets	127,284	152,676
Other assets	96	110
Total assets	243,796	214,618
Current liabilities:
Accrued employment costs	1,142	2,376
Other current liabilities	11,977	12,055
Total current liabilities	13,119	14,431
Pension and other postretirement liabilities	17,946	18,119
Long-term liabilities	71,308	73,578
Total liabilities	$ 102,373	$ 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	$ 1,020,129	$ 1,020,129
Accumulated deficit	(849,886)	(873,660)
Accumulated other comprehensive loss	(19,539)	(28,698)
Total shareholders' equity	141,423	108,490
Total liabilities and shareholders' equity	243,796	214,618
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