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Property and Equipment (Summary of Oil and Gas Properties Not Subject to Amortization) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Total oil and gas properties not subject to amortization, total | $ 3,073,448 | $ 1,580,305
Utica |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Total oil and gas properties not subject to amortization, total | 1,592,683 |
MidCon |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Total oil and gas properties not subject to amortization, total | 1,477,643 |
Niobrara |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Total oil and gas properties not subject to amortization, total | 2,172 |
Southern Louisiana |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Total oil and gas properties not subject to amortization, total | 484 |
Bakken |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Total oil and gas properties not subject to amortization, total | 98 |
Other |  |
Capitalized Costs of Unproved Properties Excluded from Amortization [Line Items] |  |
Total oil and gas properties not subject to amortization, total | $ 368 |

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- Definition The sum of the capitalized costs incurred, as of the balance sheet date, of unproved properties excluded from amortization including acquisition costs, exploration costs, development costs, and production costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 932 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-10.(c)(7)(ii)) -URI http://asc.fasb.org/extlink&oid=50486907&loc=d3e511914-122862 + Details
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