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Commitments (Details) MMcf in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2016 USD ($) MMBbls MMcf | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Commitments and Contingencies |  |  |  |
Contractual Obligation, Due in Next Twelve Months | [1] | $ 145,075 |  |
Contractual Obligation, Due in Second Year | [1] | 148,240 |  |
Contractual Obligation, Due in Third Year | [1] | 144,379 |  |
Contractual Obligation, Due in Fourth Year | [1] | 141,010 |  |
Contractual Obligation, Due in Fifth Year | [1] | 141,654 |  |
Contractual Obligation, Due after Fifth Year | [1] | 337,745 |  |
Contractual Obligation | [1] | 1,058,103 |  |
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals |  | 2,700 |  |
Operating Leases, Rent Expense |  | $ 5,200 | $ 6,100 | $ 6,500
Natural Gas Transportation Commitment [Member] |  |  |  |
Commitments and Contingencies |  |  |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume | MMcf |  | 1,461 |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume on Non-Operated Eagle Ford Assets | MMcf |  | 514 |  |
Crude Oil Transportation Commitment [Member] |  |  |  |
Commitments and Contingencies |  |  |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume | MMBbls |  | 70 |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume on Non-Operated Eagle Ford Assets | MMBbls |  | 52 |  |
Natural Gas Liquids Transportation Commitment [Member] |  |  |  |
Commitments and Contingencies |  |  |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume | MMBbls |  | 13 |  |
Oil and Gas Delivery Commitments and Contracts, Remaining Contractual Volume on Non-Operated Eagle Ford Assets | MMBbls |  | 13 |  |
Drilling Rig Leasing Contracts [Member] |  |  |  |
Commitments and Contingencies |  |  |  |
Contractual Obligation |  | $ 31,100 |  |
Early Termination Penalty For Rig Contract Cancellation |  | 14,200 |  |
Gain (Loss) on Contract Termination |  | $ (8,700) | $ (13,700) |
Water Transportation Commitment [Member] |  |  |  |
Commitments and Contingencies |  |  |  |
Water Delivery Commitments and Contracts, Remaining Contractual Volume | MMBbls |  | 25 |  |
Gas Gathering and Oil, Gas, NGL, and Water Through-put Commitments [Member] |  |  |  |
Commitments and Contingencies |  |  |  |
Contractual Obligation |  | $ 970,900 |  |
Contractual Obligation, Non-Operated Eagle Ford Assets |  | 501,900 |  |
Office Space Leases [Member] |  |  |  |
Commitments and Contingencies |  |  |  |
Contractual Obligation |  | 50,100 |  |
Gain (Loss) on Contract Termination |  | (3,200) |  |
Other miscellaneous contracts and leases [Member] |  |  |  |
Commitments and Contingencies |  |  |  |
Contractual Obligation |  | $ 6,000 |  |
[1] | During the third quarter of 2015, the Company closed its office in Tulsa, Oklahoma. These amounts include lease payments for the Tulsa office, net of sublease income. The Company expects to receive $2.7 million of total sublease income through 2019.

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