CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 139,087	$ 65,196
Accounts receivable, net	144,785	232,187
Inventories	110,868	128,441
Income taxes receivable	50,264	51,392
Prepaid expenses	4,528	8,961
Other current assets	6,274	6,031
Total current assets	455,806	492,208
Property, plant and equipment, less accumulated depreciation of $1,562,000 in 2016 and $1,423,000 in 2015	539,270	688,335
Goodwill	32,150	32,150
Other assets	25,666	24,401
Total assets	1,052,892	1,237,094
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	54,822	75,811
Accrued payroll and related expenses	14,606	16,654
Accrued insurance expenses	4,932	4,296
Accrued state, local and other taxes	6,992	2,838
Income taxes payable	4,026	7,639
Other accrued expenses	1,706	226
Total current liabilities	87,084	107,464
Long-term accrued insurance expenses	9,706	11,348
Long-term pension liabilities	30,289	33,009
Deferred income taxes	84,665	115,495
Other long-term liabilities	3,338	17,497
Total liabilities	215,082	284,813
Common stock	21,752	21,699
Capital in excess of par value
Retained earnings	832,937	948,551
Accumulated other comprehensive loss	(16,879)	(17,969)
Total stockholders' equity	837,810	952,281
Total liabilities and stockholders' equity	$ 1,052,892	$ 1,237,094