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Supplemental Gas Data PV-10 Reconciliation (Details) MMcf in Thousands, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) MMcf | Dec. 31, 2015 USD ($) MMcf | Dec. 31, 2014 USD ($) MMcf | Dec. 31, 2013 USD ($) MMcf
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Beginning reserves | MMcf | 6,251,648 | 5,642,989 | 6,827,616 | 5,731,214
Revenues | $ 11,303,409 | $ 11,837,732 | $ 28,502,852 |
Net changes in sales prices and production costs | (172,812) | (4,151,684) | 517,731 |
Net changes in sales prices and production costs | (150,819) | (589,533) | (559,563) |
Net change due to revisions in quantity estimates | (35,502) | 408,006 | 151,233 |
Net change due to extensions, discoveries and improved recovery | (54,628) | 157,016 | 418,775 |
Development costs incurred during the period | 138,813 | 666,315 | 952,733 |
Difference in previously estimated development costs compared to actual costs incurred during the period | (39,821) | 8,911 | (102,949) |
Increase Due to Purchases of Minerals in Place | 238,819 | 0 | 0 |
Decrease Due to Sales of Minerals in Place | (137,998) | 0 |  |
Changes in estimated future development costs | (158,000) | 374,982 | 595,221 |
Net change in future income taxes | 36,513 | 1,259,744 | (798,470) |
Accretion of discount and other | 271,248 | (98,611) | 128,636 |
Total standardized measure of discounted net cash flows | 955,117 | 1,019,304 | 2,984,158 | $ 1,680,811
Production costs | (5,850,941) | (6,584,947) | (10,100,868) |
Development costs | (1,550,294) | (1,220,010) | (3,368,621) |
Income tax expense | (1,482,826) | (1,532,454) | (5,711,989) |
Future Net Cash Flows | 2,419,348 | 2,500,321 | 9,321,374 |
Discounted to present value at a 10% annual rate | $ (1,464,231) | $ (1,481,017) | $ (6,337,216) |
Natural Gas [Member] |  |  |  |
Discounted Future Net Cash Flows Relating to Proved Oil and Gas Reserves [Line Items] |  |  |  |
Beginning reserves | MMcf | 5,828,398 | 5,060,214 | 6,317,600 | 5,585,107

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