Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019
Cash flows from operating activities:
Net income	$ 67,050	$ 86,035
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for deferred income taxes	4,903	19,556
Depreciation, amortization and accretion	24,606	20,062
Loss (gain) on disposal of property, plant and equipment	2,781	(4)
Unit-based compensation expense	4,339	831
Loss from equity method investments	13,279	64
Changes in operating assets and liabilities:
Accounts receivable—related party	28,166	(15,439)
Accounts receivable—third party	130	173
Accounts payable, accrued liabilities and taxes payable	(18,787)	44,842
Other	5,397	(16,723)
Net cash provided by operating activities	131,864	139,397
Cash flows from investing activities:
Additions to property, plant and equipment	(91,587)	(102,935)
Contributions to equity method investments	(66,032)	(37,420)
Distributions from equity method investments	17,870	0
Proceeds from the sale of fixed assets	42	18
Net cash used in investing activities	(139,707)	(140,337)
Cash flows from financing activities:
Proceeds from borrowings from credit facility	99,000	10,000
Payments on credit facility	0	(9,000)
Distribution equivalent rights	(1,296)	0
Net proceeds from initial public offering—public	0	719,627
Net proceeds from initial public offering—General Partner	0	1,000
Net proceeds from initial public offering—Diamondback	0	999
Units repurchased for tax withholding	(1,365)	0
Distribution to General Partner (Note 1)	(40)	0
Distribution to public (Note 1)	(25,346)	0
Distribution to Diamondback (Note 1)	(62,573)	(726,513)
Net cash provided by (used in) financing activities	8,380	(3,887)
Net increase (decrease) in cash	537	(4,827)
Cash at beginning of period	10,633	8,564
Cash at end of period	11,170	3,737
Supplemental disclosure of non-cash financing activity:
Contributions from Diamondback	0	456,055
Supplemental disclosure of non-cash investing activity:
Increase in long term assets and inventory due to contributions from Diamondback	0	456,055
Accounts payable related to capital expenditures	$ 57,357	$ 68,617