Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Cash Flows From Operating Activities
Net Income	$ 163,636	$ 85,502	$ 38,042
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Depreciation and Amortization	12,953	9,066	6,891
Deferred Income Taxes	0	28,288	23,062
Income from Equity Method Investee	(1,779)	0	0
Unit-Based Compensation	790	42	0
Other Adjustments for Noncash Items Included in Income	384	226	145
Changes in Operating Assets and Liabilities
Increase in Accounts Receivable	(12,293)	(4,637)	(13,250)
Increase (Decrease) in Accounts Payable	1,384	(104)	14,812
Other Operating Assets and Liabilities, Net	1,150	68	(308)
Net Cash Provided by Operating Activities	166,225	118,451	69,394
Cash Flows From Investing Activities
Additions to Property, Plant and Equipment	(294,664)	(41,115)	(53,259)
Additions to Investments	(68,504)	(147)	(2,294)
Distributions from Cost Method Investee	973	1,275	1,092
Deposit for Acquisition	(18,750)	0	0
Proceeds from Asset Sale — Affiliate	0	1,850	0
Net Cash Used in Investing Activities	(380,945)	(38,137)	(54,461)
Cash Flows From Financing Activities
Distributions to Parent	0	(42,480)	0
Contributions from Parent	0	1,036	11,679
Proceeds from IPO, Net of Cash Offering Costs	0	300,625	0
Distribution to Noble Subsequent to the IPO	0	(296,820)	0
Revolving Credit Facility Origination Fees and Expenses Paid	0	(1,920)	0
Distributions to Noncontrolling Interests	(21,737)	(10,057)	0
Cash Contributions from Noncontrolling Interests	105,932	325	0
Borrowings Under Revolving Credit Facility	325,000	0	0
Repayment of Revolving Credit Facility	(240,000)	0	0
Proceeds from Offerings, Net of Cash Offering Costs	312,579	0	0
Distribution to Noble for Contributed Assets	(245,000)	0	0
Distributions to Unitholders	(59,917)	0	0
Repayment of Capital Lease Obligation	(1,532)	(214)	0
Net Cash Provided by (Used in) Financing Activities	175,325	(49,505)	11,679
(Decrease) Increase in Cash and Cash Equivalents	(39,395)	30,809	26,612
Cash and Cash Equivalents at Beginning of Period	57,421	26,612	0
Cash and Cash Equivalents at End of Period	$ 18,026	$ 57,421	$ 26,612