Consolidated Statements of Changes in Equity - USD ($) $ in Thousands		Total	Parent Net Investment	Noncontrolling Interests	Limited Partner Basic	Limited Partner Subordinated Units	General Partner
Beginning Balance at Dec. 31, 2015		$ 263,539	$ 263,539	$ 0	$ 0	$ 0	$ 0
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income		45,990	45,990
Contributions from Parent		1,155	1,155
Distributions to Parent		(42,480)	(42,480)
Ending Balance at Sep. 19, 2016		268,204	268,204	0	0	0	0
Beginning Balance at Dec. 31, 2015		263,539	263,539	0	0	0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income		85,502
Ending Balance at Dec. 31, 2016		342,905	0	71,366	308,338	(36,799)	0
Beginning Balance at Sep. 19, 2016		268,204	268,204	0	0	0	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income		39,512		11,054	14,229	14,229
Elimination of Current and Deferred Tax Liability		41,428	41,428
Allocation of Net Investment to Unitholders		0	(309,632)	68,741	21,112	219,779
Proceeds from IPO, Net of Offering Costs		298,968			298,968
Proceeds from IPO Distributed to Noble		(296,820)			(26,013)	(270,807)
Unit-Based Compensation		42			42
Contributions from Noncontrolling Interests	[1]	1,628		1,628
Distributions to Noncontrolling Interests		(10,057)		(10,057)
Ending Balance at Dec. 31, 2016		342,905	0	71,366	308,338	(36,799)	0
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income		163,636		23,064	75,076	64,661	835
Contributions from Parent				(54,844)	6,371	48,473
Distributions to Parent		(245,000)			(28,459)	(216,541)
Unit-Based Compensation		790			790
Contributions from Noncontrolling Interests		123,381		123,381
Distributions to Noncontrolling Interests		(21,737)		(21,737)
Distributions to Unitholders		(59,917)			(31,672)	(27,930)	(315)
Net Proceeds from Offerings		312,172			312,172
Ending Balance at Dec. 31, 2017		616,230	0	141,230	642,616	(168,136)	520
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income		188,876		26,142	93,875	63,023	5,836
Unit-Based Compensation		1,392			1,392
Contributions from Noncontrolling Interests		605,864		605,864
Distributions to Noncontrolling Interests		(9,257)		(9,257)
Distributions to Unitholders		(86,841)			(49,610)	(33,296)	(3,935)
Black Diamond Equity Ownership Promote Vesting	[2]			(19,826)	11,624	8,202
Other		(31)			(31)
Ending Balance at Dec. 31, 2018		$ 1,316,233	$ 0	$ 744,153	$ 699,866	$ (130,207)	$ 2,421

[1] Includes an outstanding cash call as of December 31, 2016.

[2] See Note 2. Summary of Significant Accounting Policies and Basis of Presentation for further discussion of the Black Diamond equity ownership promote vesting.