CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 10,283	$ 14,163
Accounts receivable, net	375,126	387,530
Inventories	132,682	140,867
Deferred income taxes	5,952	5,777
Income taxes receivable	11,996	4,234
Prepaid expenses	10,516	10,762
Other current assets	4,110	4,494
Total current assets	550,665	567,827
Property, plant and equipment, net	758,587	756,326
Goodwill	24,093	24,093
Other assets	19,231	18,917
Total assets	1,352,576	1,367,163
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	122,797	109,846
Accrued payroll and related expenses	24,976	32,053
Accrued insurance expenses	6,404	6,152
Accrued state, local and other taxes	5,026	7,326
Income taxes payable	777	6,428
Other accrued expenses	1,397	2,706
Total current liabilities	161,377	164,511
Long-term accrued insurance expenses	10,714	10,400
Notes payable to banks	87,600	107,000
Long-term pension liabilities	27,798	26,543
Deferred income taxes	150,210	155,007
Other long-term liabilities	2,388	4,470
Total liabilities	440,087	467,931
Common stock	22,056	22,014
Retained earnings	904,860	891,464
Accumulated other comprehensive loss	(14,427)	(14,246)
Total stockholders' equity	912,489	899,232
Total liabilities and stockholders' equity	$ 1,352,576	$ 1,367,163