Consolidated Statements of Cash Flows - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018
Cash Flows From Operating Activities
Net Income		$ 116,453	$ 83,578
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Depreciation and Amortization		39,636	27,700
Loss (Income) from Equity Method Investees		2,083	(4,798)
Distributions from Equity Method Investees		6,944	3,520
Unit-Based Compensation		843	714
Other Adjustments for Noncash Items Included in Income		804	329
Changes in Operating Assets and Liabilities, Net of Assets Acquired and Liabilities Assumed
Increase in Accounts Receivable		(10,048)	(4,874)
Increase in Accounts Payable		19,364	3,241
Other Operating Assets and Liabilities, Net		(3,330)	(4,338)
Net Cash Provided by Operating Activities		172,749	105,072
Cash Flows From Investing Activities
Additions to Property, Plant and Equipment		(138,139)	(409,059)
Black Diamond Acquisition, Net of Cash Acquired		0	(650,131)
Additions to Investments		(414,587)	(119)
Distributions from Cost Method Investee and Other		588	715
Net Cash Used in Investing Activities		(552,138)	(1,058,594)
Cash Flows From Financing Activities
Distributions to Noncontrolling Interests		(11,985)	(3,529)
Contributions from Noncontrolling Interests		34,110	515,622
Borrowings Under Revolving Credit Facility		560,000	610,000
Repayment of Revolving Credit Facility		(250,000)	(165,000)
Distributions to Unitholders		(53,459)	(40,913)
Proceeds from Preferred Equity, Net of Issuance Costs		99,450	0
Debt Issuance Costs and Other		(980)	(1,987)
Net Cash Provided by Financing Activities		377,136	914,193
Decrease in Cash, Cash Equivalents, and Restricted Cash		(2,253)	(39,329)
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]	$ 9,438	$ 16,202

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