CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
ASSETS
Cash and cash equivalents	$ 15,476	$ 9,772
Accounts receivable, net	430,612	634,730
Inventories	153,698	155,611
Deferred income taxes	8,470	9,422
Income taxes receivable	14,512	29,115
Prepaid expenses	8,507	9,135
Other current assets	2,958	3,843
Total current assets	634,233	851,628
Property, plant and equipment, less accumulated depreciation of $1,289,333 in 2015 and $1,239,163 in 2014	857,632	849,383
Goodwill	32,150	32,150
Other assets	25,965	26,197
Total assets	1,549,980	1,759,358
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	91,349	175,416
Accrued payroll and related expenses	27,625	49,798
Accrued insurance expenses	6,494	5,632
Accrued state, local and other taxes	5,980	6,821
Income taxes payable	1,727	944
Other accrued expenses	384	401
Total current liabilities	133,559	239,012
Long-term accrued insurance expenses	10,868	10,099
Notes payable to banks	155,600	224,500
Long-term pension liabilities	34,561	34,399
Deferred income taxes	137,774	156,977
Other long-term liabilities	15,523	15,989
Total liabilities	487,885	680,976
Common stock	21,707	21,654
Capital in excess of par value
Retained earnings	1,059,105	1,074,561
Accumulated other comprehensive loss	(18,717)	(17,833)
Total stockholders' equity	1,062,095	1,078,382
Total liabilities and stockholders' equity	$ 1,549,980	$ 1,759,358