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Supplemental Disclosures (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Summary of current accrued liabilities |  |
Total accrued liabilities | $ 101,460 | $ 92,369
Other | 3,011 | 2,022
Accrued evaluated and unproved and unevaluated property costs [Member] |  |
Summary of current accrued liabilities |  |
Total accrued liabilities | 54,273 | 54,586
Accrued support equipment and facilities costs [Member] |  |
Summary of current accrued liabilities |  |
Total accrued liabilities | 15,139 | 17,393
Accrued lease operating expenses [Member] |  |
Summary of current accrued liabilities |  |
Total accrued liabilities | 16,009 | 7,743
Accrued interest on debt [Member] |  |
Summary of current accrued liabilities |  |
Total accrued liabilities | 6,541 | 5,806
Accrued asset retirement obligations [Member] |  |
Summary of current accrued liabilities |  |
Total accrued liabilities | 915 | 254
Accrued partners' share of joint interest charges [Member] |  |
Summary of current accrued liabilities |  |
Total accrued liabilities | $ 5,572 | $ 4,565

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