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Condensed Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Cash Flows from Operating Activities:    
Net income $ 60,613 $ 17,844
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 42,678 42,638
Amortization of financing costs 205 196
Amortization of net (gain) loss on treasury lock 1,413 (462)
Share-based compensation expense 3,637 2,594
Deferred income tax provision (877) 146,756
Alternative fuel mixture credits 6,929 (119,239)
Loss on disposals of property, plant and equipment 2,249 2,412
Pension and postretirement benefits 10,120 5,420
Other, net 721 58
Increase in assets -    
Accounts receivable (39,541) (21,125)
Inventories (1,414) (6,728)
Prepaid expenses and other current assets (3,863) (7,662)
Increase (decrease) in liabilities -    
Accounts payable 23,537 (4,930)
Accrued liabilities (10,640) (22,827)
Net cash provided by operating activities 95,767 34,945
Cash Flows from Investing Activities:    
Additions to property, plant and equipment (27,276) (34,813)
Acquisition of business   (35,531)
Additions to other long term assets (1,730) (1,406)
Proceeds from disposals of property, plant and equipment 46 11
Net cash used for investing activities (28,960) (71,739)
Cash Flows from Financing Activities:    
Payments on long-term debt (3,985) (3,955)
Common stock dividends paid   (19,665)
Repurchases of common stock (3,340) (23,230)
Proceeds from exercise of stock options 1,707 10,221
Excess tax benefits from share-based awards 763 1,127
Other (1,308)  
Net cash used for financing activities (6,163) (35,502)
Net increase (decrease) in cash and cash equivalents 60,644 (72,296)
Cash and cash equivalents, beginning of period 207,393 156,313
Cash and cash equivalents, end of period $ 268,037 $ 84,017