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Property and Equipment | 12 Months Ended
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Dec. 31, 2016
Property, Plant and Equipment [Abstract] |
PROPERTY AND EQUIPMENT | The following table presents a summary of the Company’s property and equipment balances as of December 31, 2016 and 2015 (in thousands).
|  | December 31,
|  | 2016 |  | 2015
Oil and natural gas properties |  |  |  |
Evaluated (subject to amortization) |  | $ | 2,408,305 |  |  | $ | 2,122,174 |
Unproved and unevaluated (not subject to amortization) |  | 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 |  |  |  |
Midstream equipment and facilities |  | 145,662 |  |  | 78,564 |
Furniture, fixtures and other equipment |  | 5,487 |  |  | 2,918 |
Software |  | 3,206 |  |  | 2,193 |
Land |  | 1,437 |  |  | 1,539 |
Leasehold improvements |  | 5,003 |  |  | 1,173 |
Total 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 |
The following table provides a breakdown of the Company’s unproved and unevaluated property costs not subject to amortization as of December 31, 2016 and the year in which these costs were incurred (in thousands).
Description |  | 2016 |  | 2015 |  | 2014 |  | 2013 and prior |  | Total
Costs incurred for |  |  |  |  |  |  |  |  |  |
Property acquisition |  | $ | 126,857 |  |  | $ | 236,507 |  |  | $ | 55,258 |  |  | $ | 23,654 |  |  | $ | 442,276 |
Exploration wells |  | 19,017 |  |  | 3,375 |  |  | 34 |  |  | — |  |  | 22,426 |
Development wells |  | 13,086 |  |  | 1,218 |  |  | 730 |  |  | — |  |  | 15,034 |
Total |  | $ | 158,960 |  |  | $ | 241,100 |  |  | $ | 56,022 |  |  | $ | 23,654 |  |  | $ | 479,736 |
Property acquisition costs primarily include leasehold costs paid to secure oil and natural gas mineral leases, but may also include broker and legal expenses, geological and geophysical expenses and capitalized internal costs associated with developing oil and natural gas prospects on these properties. Property acquisition costs are transferred into the amortization base on an ongoing basis as these properties are evaluated and proved reserves are established or impairment is determined. Unproved and unevaluated properties are assessed for possible impairment on a periodic basis based upon changes in operating or economic conditions. Property acquisition costs incurred that remain in unproved and unevaluated property at December 31, 2016 are related primarily to the Company’s leasehold and mineral acquisitions in the Wolfcamp and Bone Spring plays in the Delaware Basin in Southeast New Mexico and West Texas during the past four years. These costs include, in particular, the cost of the acreage acquired as part of the HEYCO Merger (as described and defined in Note 5) in 2015. These costs are associated with acreage for which proved reserves have yet to be assigned. A significant portion of these costs are associated with properties which are held by production or have automatic lease renewal options. As the Company drills wells and assigns proved reserves to these properties or determines that certain portions of this acreage, if any, cannot be assigned proved reserves, portions of these costs are transferred to the amortization base. Costs excluded from amortization also include those costs associated with exploration and development wells in progress or awaiting completion at year-end. These costs are transferred into the amortization base on an ongoing basis as these wells are completed and proved reserves are established or confirmed. These costs totaled $37.5 million at December 31, 2016. Of this total, $22.4 million was associated with exploration wells and $15.0 million was associated with development wells. The Company anticipates that most of the $37.5 million associated with these wells in progress at December 31, 2016 will be transferred to the amortization base during 2017.

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- Definition The entire disclosure for long-lived, physical assets used in the normal conduct of business and not intended for resale. Includes, but is not limited to, accounting policies and methodology, roll forwards, depreciation, depletion and amortization expense, including composite depreciation, accumulated depreciation, depletion and amortization expense, useful lives and method used, income statement disclosures, assets held for sale and public utility disclosures. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.13-14) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 205 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=64827811&loc=d3e1361-107760 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64862545&loc=d3e2921-110230 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6391035&loc=d3e2868-110229 + Details
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