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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
OPERATING ACTIVITIES    
Net income $ 153,015 $ 138,689
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, amortization and other non-cash charges 105,121 84,157
Stock-based compensation expense 3,902 3,821
Loss (gain) on disposition of assets, net 3,308 (1,489)
Deferred income tax provision 6,931 7,996
Excess tax benefits for share-based payments (2,172) (3,419)
(Increase) decrease in assets:    
Accounts receivable 47,766 (106,220)
Income taxes receivable 12,449 20,066
Inventories (18,621) (14,567)
Prepaid expenses 2,478 1,386
Other current assets (6,864) (10,479)
Other non-current assets (3,661) 40
Increase (decrease) in liabilities:    
Accounts payable 8,399 31,557
Income taxes payable (7,840) 13,293
Accrued payroll and related expenses (1,524) 1,198
Accrued insurance expenses (281) 877
Accrued state, local and other taxes 3,368 2,648
Other accrued expenses (1,056) (69)
Pension liabilities (2,148) 770
Accrued insurance expenses 230 700
Other non-current liabilities (666) (130)
Net cash provided by operating activities 302,134 170,825
INVESTING ACTIVITIES    
Capital expenditures (204,202) (203,763)
Proceeds from sale of assets 7,999 15,204
Net cash used for investing activities (196,203) (188,559)
FINANCING ACTIVITIES    
Payment of dividends (35,083) (20,680)
Borrowings from notes payable to banks 450,850 402,550
Repayments of notes payable to banks (492,150) (350,700)
Debt issue costs for notes payable to banks   (415)
Excess tax benefits for share-based payments 2,172 3,419
Cash paid for common stock purchased and retired (30,024) (18,857)
Proceeds received upon exercise of stock options 167 572
Net cash (used for) provided by financing activities (104,068) 15,889
Net increase (decrease) in cash and cash equivalents 1,863 (1,845)
Cash and cash equivalents at beginning of period 7,393 9,035
Cash and cash equivalents at end of period 9,256 7,190
Supplemental cash flows disclosure:    
Interest paid, net of amount capitalized 978 2,011
Income taxes paid, net 84,965 43,801
Supplemental disclosure of noncash investing activities:    
Capital expenditures included in accounts payable $ 18,272 $ 27,531