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Commitments (Details) |  | 12 Months Ended
--- | --- | ---
Feb. 17, 2016 USD ($) MMcf MMBbls | Dec. 31, 2015 USD ($) MMcf MMBbls | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Commitments and Contingencies |  |  |  |  |
Contractual Obligation, Due in Next Twelve Months | [1] |  | $ 132,747,000 |  |
Contractual Obligation, Due in Second Year | [1] |  | 128,074,000 |  |
Contractual Obligation, Due in Third Year | [1] |  | 131,489,000 |  |
Contractual Obligation, Due in Fourth Year | [1] |  | 142,161,000 |  |
Contractual Obligation, Due in Fifth Year | [1] |  | 141,854,000 |  |
Contractual Obligation, Due after Fifth Year | [1] |  | 288,113,000 |  |
Contractual Obligation | [1] |  | 964,438,000 |  |
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals |  |  | 3,500,000 |  |
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Next Twelve Months |  |  | 831,000 |  |
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Due in Two Years |  |  | 953,000 |  |
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Due in Three Years |  |  | 978,000 |  |
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals, Due in Four Years |  |  | 741,000 |  |
Operating Leases, Rent Expense |  |  | $ 6,100,000 | $ 6,500,000 | $ 5,700,000
Natural Gas Transportation Commitment [Member] |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume | MMcf |  |  | 2,277,000 |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume, Volumes Not Subject To Deficiency Fee | MMcf |  |  | 1,059,000 |  |
Crude Oil Transportation Commitment [Member] |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume | MMBbls |  |  | 36 |  |
Subsequent Event [Member] | Natural Gas Transportation Commitment [Member] |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Oil and Gas Delivery Commitments and Contracts, Decrease in Remaining Contractual Volume | MMcf |  | 829,000 |  |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume | MMcf |  | 310,000 |  |  |
Subsequent Event [Member] | Crude Oil Transportation Commitment [Member] |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume | MMBbls |  | 41 |  |  |
Drilling Rig Leasing Contracts [Member] |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Contractual Obligation |  |  | $ 35,300,000 |  |
Early Termination Penalty For Rig Contract Cancellation |  |  | 26,000,000 |  |
Gain (Loss) on Contract Termination |  |  | (13,700,000) |  |
Gas gathering and Oil and Gas Through-put Commitments [Member] |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Contractual Obligation |  |  | 864,000,000 |  |
Gas gathering and Oil and Gas Through-put Commitments [Member] | Subsequent Event [Member] |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Contractual Obligation |  | $ 360,800,000 |  |  |
Decrease in Contractual Obligation |  | $ 118,200,000 |  |  |
Office Space Leases [Member] |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Contractual Obligation |  |  | 59,400,000 |  |
Other miscellaneous contracts and leases [Member] |  |  |  |  |
Commitments and Contingencies |  |  |  |  |
Contractual Obligation |  |  | $ 5,700,000 |  |
[1] | During the third quarter of 2015, the Company vacated its office space in Tulsa, Oklahoma. These amounts include lease payments for the Tulsa office, net of sublease income. The Company expects to receive $3.5 million of sublease income as follows: $831,000 in 2016, $953,000 in 2017, $978,000 in 2018, and $741,000 in 2019.

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