CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 141,354	$ 65,196
Accounts receivable, net	130,903	232,187
Inventories	115,954	128,441
Income taxes receivable	50,565	51,392
Prepaid expenses	5,111	8,961
Other current assets	5,650	6,031
Total current assets	449,537	492,208
Property, plant and equipment, less accumulated depreciation of $1,520,000 in 2016 and $1,423,000 in 2015	584,963	688,335
Goodwill	32,150	32,150
Other assets	24,627	24,401
Total assets	1,091,277	1,237,094
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	39,512	75,811
Accrued payroll and related expenses	15,681	16,654
Accrued insurance expenses	4,292	4,296
Accrued state, local and other taxes	6,786	2,838
Income taxes payable	8,167	7,639
Other accrued expenses	1,608	226
Total current liabilities	76,046	107,464
Long-term accrued insurance expenses	10,085	11,348
Long-term pension liabilities	32,520	33,009
Deferred income taxes	95,257	115,495
Other long-term liabilities	3,360	17,497
Total liabilities	217,268	284,813
Common stock	21,755	21,699
Capital in excess of par value
Retained earnings	869,122	948,551
Accumulated other comprehensive loss	(16,868)	(17,969)
Total stockholders' equity	874,009	952,281
Total liabilities and stockholders' equity	$ 1,091,277	$ 1,237,094