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Consolidated Statements of Cash Flows (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Operating activities:    
Net income (loss) $ 56,139 $ 56,515
Loss from discontinued operations, net of tax (45) (77)
Income from continuing operations 56,184 56,592
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation, depletion and amortization 99,557 93,561
Earnings (loss), net of distributions, from equity method investments (51) 1,277
Deferred income taxes 35,965 44,663
Unrealized loss on commodity derivatives 6,712 5,832
Changes in current assets and liabilities, net of acquisitions:    
Receivables 25,611 32,206
Inventories (19,809) (19,126)
Other current assets (22,324) (25,855)
Accounts payable (11,525) (35,091)
Other current liabilities (28,355) (7,338)
Other noncurrent changes (4,936) (10,150)
Net cash provided by continuing operations 137,029 136,571
Net cash provided by discontinued operations 8 303
Net cash provided by operating activities 137,037 136,874
Investing activities:    
Capital expenditures (179,646) (188,475)
Acquisitions, net of cash acquired (206,304) 0
Net proceeds from sale or disposition of property and other 5,179 18,176
Investments 458 (514)
Net cash used in continuing operations (380,313) (170,813)
Net cash provided by discontinued operations 0 0
Net cash used in investing activities (380,313) (170,813)
Financing activities:    
Issuance of short-term borrowings 0 9,300
Repayment of short-term borrowings (11,500) 0
Issuance of long-term debt 309,501 112,015
Repayment of long-term debt (58,232) (67,123)
Proceeds from issuance of common stock 54,843 0
Dividends paid (33,737) (171)
Excess tax benefit on stock-based compensation 4,833 0
Contribution from noncontrolling interest 16,000 5,000
Net cash provided by continuing operations 281,708 59,021
Net cash provided by discontinued operations 0 0
Net cash provided by financing activities 281,708 59,021
Effect of exchange rate changes on cash and cash equivalents 43 25
Increase in cash and cash equivalents 38,475 25,107
Cash and cash equivalents - beginning of year 45,225 49,042
Cash and cash equivalents - end of period $ 83,700 $ 74,149