Commitments and Contingencies - Other Commitments (Details)
$ in Millions |
1 Months Ended |
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Jun. 30, 2014
USD ($)
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May 31, 2014
USD ($)
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Apr. 30, 2014
USD ($)
mi
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Dec. 31, 2016
USD ($)
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| Pipeline Connection Agreement [Member] | Divide County, North Dakota to Columbus, North Dakota [Member] |
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| Other Commitment |
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| Minimum commitment amount |
$ 55.0
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$ 47.1
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| Period of minimum take-or-pay throughput commitment |
7 years
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| Pipeline Connection Agreement [Member] | Dunn and McKenzie Counties, North Dakota to Williams County, North Dakota [Member] |
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| Other Commitment |
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| Minimum commitment amount |
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$ 36.4
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26.0
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| Minimum quarterly commitment amount |
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1.3
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| Period of minimum take-or-pay throughput commitment |
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7 years
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| Pipeline Connection Agreement [Member] | Mercer Country, North Dakota to Beulah, North Dakota [Member] |
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| Other Commitment |
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| Minimum commitment amount |
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$ 14.6
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13.2
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| Period of minimum take-or-pay throughput commitment |
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5 years
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| Length of pipeline lateral which would be built, owned and operated | mi |
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4
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| Natural Gas Transportation and Reservation Agreement [Member] |
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| Other Commitment |
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| Minimum commitment amount |
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$ 12.7
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| Pipeline connection agreement with Tesoro Logistics |
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| Other Commitment |
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| Ownership interest |
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60.00%
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