Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash Flows From Operating Activities
Net Income	$ 83,578	$ 73,627
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Depreciation and Amortization	27,700	4,921
Income from Equity Method Investee, Net of Dividends	(1,278)	(405)
Unit-Based Compensation	714	333
Other Adjustments for Noncash Items Included in Income	329	191
Changes in Operating Assets and Liabilities, Net of Assets Acquired and Liabilities Assumed
Increase in Accounts Receivable	(4,874)	(5,423)
Increase in Accounts Payable	3,241	1,409
Other Operating Assets and Liabilities, Net	(4,338)	(126)
Net Cash Provided by Operating Activities	105,072	74,527
Cash Flows From Investing Activities
Additions to Property, Plant and Equipment	(409,059)	(109,449)
Black Diamond Acquisition, Net of Cash Acquired	(650,131)	0
Additions to Investments	(119)	(68,485)
Distributions from Cost Method Investee	715	474
Net Cash Used in Investing Activities	(1,058,594)	(177,460)
Cash Flows From Financing Activities
Distributions to Noncontrolling Interests	(3,529)	(19,452)
Contributions from Noncontrolling Interests	515,622	29,330
Borrowings Under Revolving Credit Facility	610,000	195,000
Repayment of Revolving Credit Facility	(165,000)	(5,000)
Proceeds from Equity Offering, Net of Cash Offering Costs	0	138,089
Distribution to Noble for Contributed Assets	0	(245,000)
Distributions to Unitholders	(40,913)	(26,848)
Revolving Credit Facility Amendment Fees and Other	(1,987)	(982)
Net Cash Provided by Financing Activities	914,193	65,137
Decrease in Cash, Cash Equivalents, and Restricted Cash	(39,329)	(37,796)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period	55,531	57,421
Cash, Cash Equivalents, and Restricted Cash at End of Period	$ 16,202	$ 19,625