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Derivative Instruments - Narrative (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2017 USD ($) Bcf MBbls | Dec. 31, 2016 USD ($) MBbls | Dec. 31, 2015 Bcf
Derivative Instruments and Hedging Activities Disclosure [Abstract] |  |  |
Deferred net gains in accumulated other comprehensive income (loss), net of tax | $ 8,700,000 | $ 9,600,000 |
Net gains on derivative commodity instruments | $ 4,300,000 |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Maximum additional collateral as percentage of derivative liability | 100.00% |  |
Aggregate fair value of derivative instruments with credit-risk related contingencies | $ 91,200,000 |  |
Collateral posted | $ 0 |  |
Propane swap |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Volume of derivative instruments (in Bcf, Mbbls) | MBbls | 1,008 | 1,095 |
Cash flow hedging | Commodity derivatives |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Volume of derivative instruments (in Bcf, Mbbls) | Bcf | 805 |  | 703

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- Definition Accumulated change, net of tax, in accumulated gains and losses from derivative instruments designated and qualified as the effective portion of cash flow hedges, excluding certain interest rate swap transactions. + References No definition available. + Details
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- Definition The upper limit of the percentage of derivative liability that the entity may be required to post with counterparties. + References No definition available. + Details
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- Definition The aggregate fair value of assets that are already posted, at the end of the reporting period, as collateral for derivative instruments with credit-risk-related contingent features. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624258-113959 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624258-113959 + Details
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- Definition Nominal volume used to calculate payments on a derivative instrument. + References No definition available. + Details
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- Definition The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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