CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 91,050	$ 131,835
Accounts receivable, net	377,853	169,166
Inventories	114,866	108,316
Income taxes receivable	40,243	57,174
Prepaid expenses	8,992	6,718
Other current assets	7,131	5,848
Current assets	640,135	479,057
Property, plant and equipment, net	443,928	497,986
Goodwill	32,150	32,150
Other assets	31,011	26,259
Total assets	1,147,224	1,035,452
LIABILITIES
Accounts payable	103,462	70,536
Accrued payroll and related expenses	23,577	12,130
Accrued insurance expenses	5,299	4,099
Accrued state, local and other taxes	8,655	3,094
Income taxes payable	3,224	4,929
Other accrued expenses	1,143	6,680
Current liabilities	145,360	101,468
Long-term accrued insurance expenses	10,376	9,537
Long-term pension liabilities	35,635	32,864
Deferred income taxes	39,437	81,466
Other long-term liabilities	4,719	3,318
Total liabilities	235,527	228,653
Commitments and contingencies (Note 9)
STOCKHOLDERS' EQUITY
Preferred stock, $0.10 par value, 1,000,000 shares authorized, none issued
Common stock, $0.10 par value, 349,000,000 shares authorized, 216,543,552 and 217,489,402 shares issued and outstanding in 2017 and 2016, respectively	21,654	21,749
Capital in excess of par value	0	0
Retained earnings	906,745	803,152
Accumulated other comprehensive loss	(16,702)	(18,102)
Total stockholders' equity	911,697	806,799
Total liabilities and stockholders' equity	$ 1,147,224	$ 1,035,452