Revenue Recognition (Tables)

6 Months Ended

Jun. 30, 2018

Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Table Text Block]

The following table presents the transaction price allocated to the remaining performance obligations under certain contracts as of June 30, 2018. These primarily include reservation charges on contracted capacity on our firm transportation and storage contracts with customers. Amounts from certain contracts included in the table below reflect the rates from such services, which are subject to the periodic review and approval by the FERC, for the life of the related contracts; however, these rates may change based on future rate cases or settlements approved by the FERC and the amount and timing of these changes is not currently known. As a practical expedient permitted by ASC 606, this table excludes the variable consideration component for commodity charges that will be recognized in future periods. As noted above, certain of our contracts contain evergreen provisions for periods beyond the initial term of the contract. The remaining performance obligations as of June 30, 2018, does not consider potential future performance obligations for which the renewal has not been exercised. The table below also does not include contracts with customers for which the underlying facilities have not received FERC authorization to be placed into service.



	(Thousands)
2018 (remainder)	$	215,736
2019	426,863
2020	400,981
2021	377,760
2022	371,918
2023	326,571
Thereafter	1,772,655
Total	$	3,892,484