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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Cash Flows from Operating Activities:      
Net income $ 163,820 $ 158,027 $ 205,435
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion and amortization 171,280 163,973 156,298
Amortization of financing costs 1,116 712 648
Amortization of net loss on treasury lock 2,988 (1,846) (1,846)
Share-based compensation expense 11,687 9,736 7,006
Deferred income tax provision 183,202 27,347 (120,579)
Alternative fuel mixture credits (76,281)   127,811
Loss on disposals of property, plant and equipment 7,298 7,137 8,865
Loss on early extinguishment of debt 21,296    
Pension and postretirement benefits 1,687 5,726 11,142
Other, net (3,090) (4,761) 1,083
Increase in assets -      
Accounts receivable (24,995) (16,946) (50,256)
Inventories (12,212) (8,333) (28,352)
Prepaid expenses and other current assets (835) (616) (3,956)
Increase (decrease) in liabilities -      
Accounts payable (40,448) (694) 25,367
Accrued liabilities (2,308) 6,052 11,254
Net cash provided by operating activities 404,205 345,514 349,920
Cash Flows from Investing Activities:      
Additions to property, plant and equipment (128,524) (280,213) (320,200)
Acquisitions of businesses (35,393) (57,340)  
Treasury grant proceeds 57,399    
Additions to other long term assets (1,070) (13,055) (2,627)
Proceeds from disposals of property, plant and equipment 78 443 1,513
Net cash used for investing activities (107,510) (350,165) (321,314)
Cash Flows from Financing Activities:      
Proceeds from long-term debt 397,044 150,000  
Payments on long-term debt (437,184) (670) (626)
Financing costs paid (876) (2,041)  
Settlement of treasury lock (65,500) 9,910  
Common stock dividends paid (117,851) (76,012) (61,798)
Repurchases of common stock (45,162) (125,027) (38,901)
Proceeds from exercise of stock options 19,898 7,016 7,496
Excess tax benefits from share-based awards 4,016 1,232 1,052
Net cash used for financing activities (245,615) (35,592) (92,777)
Net increase (decrease) in cash and cash equivalents 51,080 (40,243) (64,171)
Cash and cash equivalents, beginning of year 156,313 196,556 260,727
Cash and cash equivalents, end of year $ 207,393 $ 156,313 $ 196,556