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Commitments (Details) (USD $) | 12 Months Ended | 9 Months Ended | 12 Months Ended |  | 12 Months Ended
--- | --- | --- | --- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 Drilling Rig Leasing Contracts | Dec. 31, 2013 Gas gathering through-put commitments | Sep. 30, 2013 Office Space Leases | Dec. 31, 2013 Office Space Leases | Dec. 31, 2013 Other miscellaneous contracts and leases | Dec. 31, 2013 Natural Gas [Member] MMcf | Dec. 31, 2013 Crude Oil [Member] MMBbls | Dec. 31, 2013 Shares Issued to the Board of Directors [Member] | Dec. 31, 2012 Shares Issued to the Board of Directors [Member] | Dec. 31, 2011 Shares Issued to the Board of Directors [Member] | Dec. 31, 2013 Pending Litigation [Member]
Commitments and Contingencies |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock-based compensation expense | $ 32,347,000 | $ 30,185,000 | $ 26,824,000 |  |  |  |  |  |  |  | $ 1,400,000 | $ 1,300,000 | $ 1,200,000 |
Long-term Purchase Commitment, Amount |  |  |  | 65,700,000 | 1,100,000,000 | 12,900,000 | 69,400,000 | 7,600,000 |  |  |  |  |  |
Long-term Purchase Commitment, Time Period | 12 years |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Due in Next Twelve Months | 179,118,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Due in Second Year | 147,119,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Due in Third Year | 144,438,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Due in Fourth Year | 132,559,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Due in Fifth Year | 128,418,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Contractual Obligation, Due after Fifth Year | 481,947,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Commitment amount | 1,213,599,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume |  |  |  |  |  |  |  |  | 1,807,000,000,000 | 53,000,000 |  |  |  |
Operating Leases, Rent Expense | 5,700,000 | 5,400,000 | 3,700,000 |  |  |  |  |  |  |  |  |  |  |
Other Commitment | 33,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated Litigation Liability | 23,100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Accounts Payable and Other Accrued Liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,600,000
Amount paid (related to litigation) |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 13,500,000

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