CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Cash and cash equivalents	$ 9,772	$ 8,700
Accounts receivable, net	634,730	437,132
Inventories	155,611	126,604
Deferred income taxes	9,422	14,185
Income taxes receivable	29,115	5,720
Prepaid expenses	9,135	9,143
Other current assets	3,843	3,441
Current assets	851,628	604,925
Property, plant and equipment, net	849,383	726,307
Goodwill	32,150	31,861
Other assets	26,197	20,767
Total assets	1,759,358	1,383,860
LIABILITIES
Accounts payable	175,416	119,170
Accrued payroll and related expenses	49,798	36,638
Accrued insurance expenses	5,632	6,072
Accrued state, local and other taxes	6,821	5,002
Income taxes payable	944
Other accrued expenses	401	1,170
Current liabilities	239,012	168,052
Long-term accrued insurance expenses	10,099	10,225
Notes payable to banks	224,500	53,300
Long-term pension liabilities	34,399	21,966
Deferred income taxes	156,977	153,176
Other long-term liabilities	15,989	8,439
Total liabilities	680,976	415,158
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, 216,539,015 and 218,985,816 shares issued and outstanding in 2014 and 2013, respectively	21,654	21,899
Capital in excess of par value
Retained earnings	1,074,561	956,918
Accumulated other comprehensive loss	(17,833)	(10,115)
Total stockholders' equity	1,078,382	968,702
Total liabilities and stockholders' equity	$ 1,759,358	$ 1,383,860