Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash Flows From Operating Activities
Net Income	$ 132,281	$ 117,383
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Depreciation and Amortization	46,076	8,483
Income from Equity Method Investee, Net of Dividends	(4,049)	(821)
Unit-Based Compensation	1,057	581
Other Adjustments for Noncash Items Included in Income	523	288
Changes in Operating Assets and Liabilities, Net of Assets Acquired and Liabilities Assumed
Increase in Accounts Receivable	(14,054)	(7,273)
Increase in Accounts Payable	7,173	5,816
Other Operating Assets and Liabilities, Net	(1,071)	(100)
Net Cash Provided by Operating Activities	167,936	124,357
Cash Flows From Investing Activities
Additions to Property, Plant and Equipment	(540,991)	(185,442)
Black Diamond Acquisition, Net of Cash Acquired	(649,868)	0
Additions to Investments	(426)	(68,504)
Distributions from Cost Method Investee	1,020	728
Net Cash Used in Investing Activities	(1,190,265)	(253,218)
Cash Flows From Financing Activities
Distributions to Noncontrolling Interests	(5,814)	(19,849)
Contributions from Noncontrolling Interests	593,034	52,806
Borrowings Under Revolving Credit Facility	690,000	245,000
Repayment of Revolving Credit Facility	(725,000)	(45,000)
Proceeds from Term Loan Credit Facility	500,000	0
Proceeds from Equity Offering, Net of Cash Offering Costs	0	138,084
Distribution to Noble for Contributed Assets	0	(245,000)
Distributions to Unitholders	(63,220)	(42,937)
Debt Issuance Costs and Other	(3,050)	(982)
Net Cash Provided by Financing Activities	985,950	82,122
Decrease in Cash, Cash Equivalents, and Restricted Cash	(36,379)	(46,739)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	55,531	57,421
Cash, Cash Equivalents, and Restricted Cash at End of Period	$ 19,152	$ 10,682