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Property and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Oil and natural gas properties |  |
Evaluated (subject to amortization) | $ 2,408,305 | $ 2,122,174
Total unproved and unevaluated | 479,736 | 387,504
Total oil and natural gas properties | 2,888,041 | 2,509,678
Accumulated depletion | (1,850,882) | (1,574,040)
Net oil and natural gas properties | 1,037,159 | 935,638
Other property and equipment |  |
Other property and equipment | 160,795 | 86,387
Accumulated depreciation | (13,429) | (9,619)
Net other property and equipment | 147,366 | 76,768
Net property and equipment | 1,184,525 | 1,012,406
Midstream equipment and facilities |  |
Other property and equipment |  |
Other property and equipment | 145,662 | 78,564
Furniture, fixtures and other equipment |  |
Other property and equipment |  |
Other property and equipment | 5,487 | 2,918
Software |  |
Other property and equipment |  |
Other property and equipment | 3,206 | 2,193
Land |  |
Other property and equipment |  |
Other property and equipment | 1,437 | 1,539
Leasehold improvements |  |
Other property and equipment |  |
Other property and equipment | $ 5,003 | $ 1,173

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