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Commitments and Contingencies (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Lease Commitments |  |  |
Rent expense | $ 12,300,000 | $ 11,600,000 | $ 13,600,000
Future minimum rental commitments under non-cancelable leases |  |  |
2014 | 5,881,000 |  |
2015 | 4,985,000 |  |
2016 | 2,484,000 |  |
2017 | 825,000 |  |
2018 | 166,000 |  |
Aggregate future minimum rental commitments | 14,341,000 |  |
Drilling Rig Commitments |  |  |
Drilling Rig Commitments |  |  |
Number of drilling rig commitments | 2 |  |
Drilling Rig Commitments |  |  |
2014 | 16,300,000 |  |
2015 | 7,200,000 |  |
2016 | 4,400,000 |  |
Drilling Rig Commitments | Minimum |  |  |
Drilling Rig Commitments |  |  |
Drilling rig commitment term | 2 years |  |
Drilling Rig Commitments | Maximum |  |  |
Drilling Rig Commitments |  |  |
Drilling rig commitment term | 3 years |  |
Transportation and Gathering Agreements |  |  |
Future minimum obligations under transportation and gathering |  |  |
2014 | 96,939,000 |  |
2015 | 125,350,000 |  |
2016 | 137,147,000 |  |
2017 | 132,070,000 |  |
2018 | 108,903,000 |  |
Thereafter | 1,212,376,000 |  |
Future minimum obligations under transportation and gathering | $ 1,812,785,000 |  |

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