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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Cash Flows from Operating Activities:    
Net income $ 90,086 $ 62,294
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion, and amortization of intangibles and deferred financing costs 86,040 44,296
Share-based compensation expense 3,588 3,637
Deferred income tax provision 15,645 196
Alternative energy tax credits 0 6,929
Pension and postretirement benefits expense, net of contributions 6,155 10,120
Other, net 2,788 2,970
Increase in assets -    
Accounts receivable (43,429) (39,541)
Inventories (13,035) (4,168)
Prepaid expenses and other current assets (8,677) (3,863)
Increase (decrease) in liabilities -    
Accounts payable 4,255 23,537
Accrued liabilities 5,883 (10,640)
Net cash provided by operating activities 149,299 95,767
Cash Flows from Investing Activities:    
Additions to property, plant, and equipment (50,933) (27,276)
Additions to other long term assets (2,746) (1,730)
Other 77 46
Net cash used for investing activities (53,602) (28,960)
Cash Flows from Financing Activities:    
Repayments of debt and capital lease obligations (66,251) (3,985)
Common stock dividends paid (39,297) 0
Repurchases of common stock 0 (3,340)
Proceeds from exercise of stock options 3,348 1,707
Excess tax benefits from share-based awards 3,659 763
Shares withheld to cover employee restricted stock taxes (2,395) (1,308)
Other (15) 0
Net cash used for financing activities (100,951) (6,163)
Net increase (decrease) in cash and cash equivalents (5,254) 60,644
Cash and cash equivalents, beginning of period 190,960 207,393
Cash and cash equivalents, end of period $ 185,706 $ 268,037