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Derivative Instruments (Details) $ in Thousands	3 Months Ended	12 Months Ended
Derivative Instruments (Details) $ in Thousands	Mar. 31, 2017 USD ($) MMcf	Dec. 31, 2014 MMcf	Dec. 31, 2016 USD ($)
Commodity Member [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMcf	819,100,000,000	744,700,000,000
Derivative Liability, Current \| $	$ 25,838		$ 67,139
Derivative Liability, Noncurrent \| $	122,747		209,980
Derivative Asset, Noncurrent \| $	$ 58,422		$ 29,596
Basis Member [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMcf	476,800,000,000	482,000,000,000
Propane [Member]
Derivative [Line Items]
Derivative, Nonmonetary Notional Amount, Volume \| MMcf	0	126,000

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset, expected to be settled within one year or normal operating cycle, if longer. Includes assets not subject to a master netting arrangement and not elected to be offset.

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