CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
ASSETS
Cash and cash equivalents	$ 108,309	$ 65,196
Accounts receivable, net	175,554	232,187
Inventories	125,089	128,441
Income taxes receivable	41,294	51,392
Prepaid expenses	7,384	8,961
Other current assets	5,832	6,031
Total current assets	463,462	492,208
Property, plant and equipment, less accumulated depreciation of $1,477,000 in 2016 and $1,423,000 in 2015	635,307	688,335
Goodwill	32,150	32,150
Other assets	24,277	24,401
Total assets	1,155,196	1,237,094
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	45,884	75,811
Accrued payroll and related expenses	16,077	16,654
Accrued insurance expenses	4,964	4,296
Accrued state, local and other taxes	3,978	2,838
Income taxes payable	8,704	7,639
Other accrued expenses	2,294	226
Total current liabilities	81,901	107,464
Long-term accrued insurance expenses	10,249	11,348
Long-term pension liabilities	32,077	33,009
Deferred income taxes	107,769	115,495
Other long-term liabilities	3,377	17,497
Total liabilities	235,373	284,813
Common stock	$ 21,761	$ 21,699
Capital in excess of par value
Retained earnings	$ 915,221	$ 948,551
Accumulated other comprehensive loss	(17,159)	(17,969)
Total stockholders' equity	919,823	952,281
Total liabilities and stockholders' equity	$ 1,155,196	$ 1,237,094