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CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
OPERATING ACTIVITIES    
Net income $ 35,076 $ 80,755
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, amortization and other non-cash charges 53,572 51,605
Stock-based compensation expense 2,105 1,901
Loss on disposition of assets, net 2,640 1,404
Deferred income tax provision (5,009) (11,290)
Excess tax benefits for share-based payments (3,232) (2,067)
(Increase) decrease in assets:    
Accounts receivable 12,325 35,600
Income taxes receivable (4,530) 12,311
Inventories 8,017 (11,291)
Prepaid expenses 246 1,153
Other current assets 234 578
Other non-current assets (324) (4,197)
Increase (decrease) in liabilities:    
Accounts payable 4,578 12,583
Income taxes payable (5,651) 24,698
Accrued payroll and related expenses (7,077) (6,929)
Accrued insurance expenses 252 394
Accrued state, local and other taxes (2,300) 635
Other accrued expenses (1,296) (908)
Pension liabilities 1,451 (2,027)
Long-term accrued insurance expenses 314 254
Other non-current liabilities (2,082) (1,542)
Net cash provided by operating activities 89,309 183,620
INVESTING ACTIVITIES    
Capital expenditures (53,040) (121,408)
Proceeds from sale of assets 2,995 3,680
Net cash used for investing activities (50,045) (117,728)
FINANCING ACTIVITIES    
Payment of dividends (22,015) (17,571)
Borrowings from notes payable to banks 227,600 282,100
Repayments of notes payable to banks (247,000) (304,600)
Excess tax benefits for share-based payments 3,232 2,067
Cash paid for common stock purchased and retired (4,961) (29,675)
Proceeds received upon exercise of stock options   128
Net cash used for financing activities (43,144) (67,551)
Net decrease in cash and cash equivalents (3,880) (1,659)
Cash and cash equivalents at beginning of period 14,163 7,393
Cash and cash equivalents at end of period 10,283 5,734
Supplemental cash flows disclosure:    
Interest paid, net of amount capitalized 26 357
Income taxes paid, net 37,591 24,879
Supplemental disclosure of noncash investing activities:    
Capital expenditures included in accounts payable $ 32,812 $ 29,468