Consolidated Statements of Cash Flows - USD ($) $ in Thousands		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Cash Flows From Operating Activities
Net Income		$ 63,255	$ 39,136
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Depreciation and Amortization		19,351	11,329
Distributions from Equity Method Investees, Net of Income		5,632	393
Unit-Based Compensation		564	321
Other Adjustments for Noncash Items Included in Income		197	167
Changes in Operating Assets and Liabilities, Net of Assets Acquired and Liabilities Assumed
Increase in Accounts Receivable		(10,711)	(2,520)
Increase (Decrease) in Accounts Payable		3,081	(836)
Other Operating Assets and Liabilities, Net		2,575	(2,387)
Net Cash Provided by Operating Activities		83,944	45,603
Cash Flows From Investing Activities
Additions to Property, Plant and Equipment		(70,754)	(161,509)
Black Diamond Acquisition, Net of Cash Acquired		0	(650,131)
Additions to Investments		(270,603)	0
Distributions from Cost Method Investee		289	419
Net Cash Used in Investing Activities		(341,068)	(811,221)
Cash Flows From Financing Activities
Distributions to Noncontrolling Interests		(4,669)	(3,007)
Contributions from Noncontrolling Interests		15,969	409,865
Borrowings Under Revolving Credit Facility		345,000	405,000
Repayment of Revolving Credit Facility		(175,000)	(55,000)
Distributions to Unitholders		(25,667)	(19,860)
Proceeds from Preferred Equity, Net of Issuance Costs		99,450	0
Debt Issuance Costs and Other		(94)	(1,987)
Net Cash Provided by Financing Activities		254,989	735,011
Decrease in Cash, Cash Equivalents, and Restricted Cash		(2,135)	(30,607)
Cash, Cash Equivalents, and Restricted Cash at Beginning of Period (1)	[1]	11,691	55,531
Cash, Cash Equivalents, and Restricted Cash at End of Period (1)	[1]	$ 9,556	$ 24,924

[1] See Note 2. Basis of Presentation for our reconciliation of total cash.