Consolidated Statement of Changes in Equity - USD ($) $ in Thousands		Total	Noncontrolling Interests	Limited Partner Common Units	Limited Partner Subordinated Units Noble	General Partner
Capital, beginning at Dec. 31, 2016		$ 342,905	$ 71,366	$ 308,338	$ (36,799)	$ 0
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income		117,383	19,779	51,117	46,172	315
Contributions from Noncontrolling Interests		51,503	51,503
Distributions to Noncontrolling Interests		(19,849)	(19,849)
Distributions to Unitholders		(42,937)		(22,333)	(20,512)	(92)
Net Proceeds from Private Placement		138,084		138,084
Distribution to Noble for the Contributed Assets		(245,000)		(28,459)	(216,541)
Black Diamond Equity Ownership Promote Vesting			(54,844)	6,371	48,473
Unit-Based Compensation		581		581
Capital, ending at Sep. 30, 2017		342,670	67,955	453,699	(179,207)	223
Capital, beginning at Dec. 31, 2017		616,230	141,230	642,616	(168,136)	520
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income		132,281	11,719	70,093	47,054	3,415
Contributions from Noncontrolling Interests		593,034	593,034
Distributions to Noncontrolling Interests		(5,814)	(5,814)
Distributions to Unitholders		(63,220)		(36,352)	(24,395)	(2,473)
Black Diamond Equity Ownership Promote Vesting	[1]		(12,657)	7,335	5,322
Unit-Based Compensation		1,057		1,057
Other		(34)		(34)
Capital, ending at Sep. 30, 2018		$ 1,273,534	$ 727,512	$ 684,715	$ (140,155)	$ 1,462

[1] See Note 2. Basis of Presentation for further discussion of the Black Diamond equity ownership promote vesting.