CONSOLIDATED BALANCE SHEETS (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 9,256	$ 7,393
Accounts receivable, net	413,511	461,272
Inventories	119,046	100,438
Deferred income taxes	8,947	7,183
Income taxes receivable	528	10,805
Prepaid expenses	6,000	8,478
Other current assets	37,591	30,986
Total current assets	594,879	626,555
Property, plant and equipment, net	748,806	675,360
Goodwill	24,093	24,093
Other assets	15,863	12,203
Total assets	1,383,641	1,338,211
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable	117,003	122,987
Accrued payroll and related expenses	32,156	33,680
Accrued insurance expenses	5,463	5,744
Accrued state, local and other taxes	8,434	5,066
Income taxes payable	2,865	10,705
Other accrued expenses	235	1,284
Total current liabilities	166,156	179,466
Long-term accrued insurance expenses	9,230	9,000
Notes payable to banks	162,000	203,300
Long-term pension liabilities	21,963	24,445
Other long-term liabilities	2,814	3,480
Deferred income taxes	164,665	155,928
Total liabilities	526,828	575,619
Common stock	21,943	22,119
Retained earnings	847,443	753,119
Accumulated other comprehensive loss	(12,573)	(12,646)
Total stockholders' equity	856,813	762,592
Total liabilities and stockholders' equity	$ 1,383,641	$ 1,338,211