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Condensed Consolidating Financial Information (Condensed Consolidating Balance Sheets) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2012
Dec. 31, 2011
Cash and cash equivalents $ 25,685 $ 53,583 $ 41,499 $ 15,627
Restricted cash    8,542    
Accounts receivable 445,936 377,638    
Inventories 38,100 28,141    
Other current assets 283,112 341,008    
Total current assets 792,833 808,912    
Property and equipment 14,268,389 13,028,439    
Less: Accumulated depreciation, depletion and amortization (7,574,133) (7,191,463)    
Total property and equipment, net 6,694,256 5,836,976    
Other assets 148,102 91,639    
TOTAL ASSETS 7,635,191 6,737,527 7,639,210 [1]  
Accounts payable 688,641 556,980    
Other current liabilities 158,414 210,791    
Total current liabilities 847,055 767,771    
Long-term debt 1,897,734 1,668,273    
Deferred income taxes 1,260,546 1,049,138    
Other liabilities 256,261 216,473    
Total liabilities 4,261,596 3,701,655    
Commitments and Contingencies          
Total Equity 3,373,595 3,035,872    
TOTAL LIABILITIES AND EQUITY 7,635,191 6,737,527    
Parent [Member]
        
Cash and cash equivalents 25,303 47,491 36,888 14,711
Restricted cash   8,542    
Accounts receivable 2,642 2,677    
Inventories   2    
Other current assets 5,331 7,461    
Total current assets 33,276 66,173    
Intercompany receivables 2,510,744 2,259,713    
Property and equipment 231,348 220,837    
Less: Accumulated depreciation, depletion and amortization (95,880) (82,178)    
Total property and equipment, net 135,468 138,659    
Investments in subsidiaries (equity method) 2,632,570 2,309,947    
Other assets 33,704 35,136    
TOTAL ASSETS 5,345,762 4,809,628    
Accounts payable 132,447 140,367    
Other current liabilities 3,758 3,758    
Total current liabilities 136,205 144,125    
Long-term debt 1,897,734 1,668,273    
Deferred income taxes (130,850) (116,207)    
Other liabilities 69,078 77,565    
Total liabilities 1,972,167 1,773,756    
Total Equity 3,373,595 3,035,872    
TOTAL LIABILITIES AND EQUITY 5,345,762 4,809,628    
Guarantors [Member]
        
Cash and cash equivalents   5,988 4,209  
Accounts receivable 420,119 353,607    
Inventories 36,045 26,975    
Other current assets 270,094 321,396    
Total current assets 726,258 707,966    
Intercompany receivables 66 42    
Property and equipment 12,617,326 11,491,222    
Less: Accumulated depreciation, depletion and amortization (7,264,007) (6,923,106)    
Total property and equipment, net 5,353,319 4,568,116    
Other assets 98,372 42,247    
TOTAL ASSETS 6,178,015 5,318,371    
Accounts payable 461,157 375,604    
Other current liabilities 152,810 205,623    
Total current liabilities 613,967 581,227    
Intercompany payables 2,541,556 2,108,360    
Deferred income taxes 993,255 820,279    
Other liabilities 172,997 124,505    
Total liabilities 4,321,775 3,634,371    
Total Equity 1,856,240 1,684,000    
TOTAL LIABILITIES AND EQUITY 6,178,015 5,318,371    
Non-Guarantors [Member]
        
Cash and cash equivalents 382 104 402 916
Accounts receivable 23,175 21,354    
Inventories 2,055 1,164    
Other current assets 7,687 12,151    
Total current assets 33,299 34,773    
Intercompany receivables 30,746 27,077    
Property and equipment 1,419,715 1,316,380    
Less: Accumulated depreciation, depletion and amortization (214,246) (186,179)    
Total property and equipment, net 1,205,469 1,130,201    
Other assets 16,026 14,256    
TOTAL ASSETS 1,285,540 1,206,307    
Accounts payable 95,037 41,009    
Other current liabilities 1,846 1,410    
Total current liabilities 96,883 42,419    
Intercompany payables   178,472    
Deferred income taxes 398,141 345,066    
Other liabilities 14,186 14,403    
Total liabilities 509,210 580,360    
Total Equity 776,330 625,947    
TOTAL LIABILITIES AND EQUITY 1,285,540 1,206,307    
Eliminations [Member]
        
Intercompany receivables (2,541,556) (2,286,832)    
Investments in subsidiaries (equity method) (2,632,570) (2,309,947)    
TOTAL ASSETS (5,174,126) (4,596,779)    
Intercompany payables (2,541,556) (2,286,832)    
Total liabilities (2,541,556) (2,286,832)    
Total Equity (2,632,570) (2,309,947)    
TOTAL LIABILITIES AND EQUITY $ (5,174,126) $ (4,596,779)    
[1] Capital investments includes increases of $7.5 million and $0.2 million for the three-month periods ended June 30, 2013 and 2012, respectively, and increases of $40.4 million and $15.5 million for the six-month periods ended June 30, 2013 and 2012, respectively, relating to the change in accrued expenditures between periods.