CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 7,393	$ 9,035
Accounts receivable, net	461,272	294,002
Inventories	100,438	64,059
Deferred income taxes	7,183	7,426
Income taxes receivable	10,805	17,251
Prepaid expenses	8,478	5,695
Other current assets	30,986	1,210
Current assets	626,555	398,678
Property, plant and equipment, net	675,360	453,017
Goodwill	24,093	24,093
Other assets	12,203	12,083
Total assets	1,338,211	887,871
LIABILITIES
Accounts payable	122,987	78,743
Accrued payroll and related expenses	33,680	23,881
Accrued insurance expenses	5,744	5,141
Accrued state, local and other taxes	5,066	2,988
Income taxes payable	10,705	5,788
Other accrued expenses	1,284	963
Current liabilities	179,466	117,504
Long-term accrued insurance expenses	9,000	8,489
Notes payable to banks	203,300	121,250
Long-term pension liabilities	24,445	18,397
Other long-term liabilities	3,480	2,448
Deferred income taxes	155,928	80,888
Total liabilities	575,619	348,976
Commitments and contingencies
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, 147,458,440 and 148,175,995 shares issued and outstanding in 2011 and 2010, respectively	14,746	14,818
Capital in excess of par value		6,460
Retained earnings	760,492	527,150
Accumulated other comprehensive loss	(12,646)	(9,533)
Total stockholders' equity	762,592	538,895
Total liabilities and stockholders' equity	$ 1,338,211	$ 887,871