Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 257,319	$ 256,947
Income tax refund receivable	938	3,903
Other current assets	2,070	3,232
Total current assets	260,327	264,082
Right-of-use asset	501
Income tax refund receivable, non-current	774	774
Investments in affiliates	86,725	24,574
Deferred tax assets	37,568	40,520
Other assets	38	350
Total assets	385,933	330,300
Current liabilities:
Accrued employment costs	2,145	2,573
Other current liabilities	1,791	1,495
Total current liabilities	3,936	4,068
Pension and other postretirement liabilities	14,792	15,167
Other liabilities	15,962	13,499
Total liabilities	34,690	32,734
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	(612,531)	(695,521)
Accumulated other comprehensive loss	(46,933)	(17,620)
Total shareholders' equity	351,243	297,566
Total liabilities and shareholders' equity	385,933	330,300
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