Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 47,651	$ 58,853
Other current assets	3,102	2,979
Total current assets	50,753	61,832
Investments in affiliates	104,793
Long-term deferred tax assets	126,194	152,676
Other assets	82	110
Total assets	281,822	214,618
Current liabilities:
Accrued employment costs	1,421	2,376
Other current liabilities	9,435	12,055
Total current liabilities	10,856	14,431
Pension and other postretirement liabilities	17,802	18,119
Long-term liabilities	71,860	73,578
Total liabilities	100,518	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	(810,422)	(873,660)
Accumulated other comprehensive loss	(19,122)	(28,698)
Total shareholders' equity	181,304	108,490
Total liabilities and shareholders' equity	281,822	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