Consolidated Statements of Changes in Equity - USD ($) $ in Thousands		Total		Parent Net Investment		Noncontrolling Interests	Limited Partner Common Units		Limited Partner Subordinated Units		General Partner
Parent Net Investment at Dec. 31, 2016				$ 144,157
Increase (Decrease) in Net Parent Investment [Roll Forward]
Contributions from parent				58,678		$ (54,844)	$ 6,371		$ 48,473
Distributions to parent		$ 245,000	[1]	29,537			28,459	[1]	216,541	[1]
Parent Net Investment at Dec. 31, 2017				170,429
Beginning Balance at Dec. 31, 2016		487,062				71,366	308,338		(36,799)		$ 0
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income		160,767		(2,869)		23,064	75,076		64,661		835
Contributions from Noncontrolling Interests		182,059				123,381
Distributions to Noncontrolling Interests		(51,274)				(21,737)
Distributions to Unitholders		(59,917)					(31,672)		(27,930)		(315)
Preferred Equity Accretion		312,172					312,172
Distributions to Noble		245,000	[1]	29,537			28,459	[1]	216,541	[1]
Contributed Assets Transfer from Noble				58,678		(54,844)	6,371		48,473
Unit-Based Compensation and Other		790					790
Ending Balance at Dec. 31, 2017		786,659				141,230	642,616		(168,136)		520
Increase (Decrease) in Net Parent Investment [Roll Forward]
Contributions from parent				849
Distributions to parent				28,799
Parent Net Investment at Dec. 31, 2018		170,322		170,322
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income		216,719		27,843		26,142	93,875		63,023		5,836
Contributions from Noncontrolling Interests		606,713				605,864
Distributions to Noncontrolling Interests		(38,056)				(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
Distributions to Noble				28,799
Contributed Assets Transfer from Noble				849
Unit-Based Compensation and Other		1,361					1,361
Ending Balance at Dec. 31, 2018		1,486,555				744,153	699,866		(130,207)		2,421
Increase (Decrease) in Net Parent Investment [Roll Forward]
Distributions to parent		670,000	[1]	54,889	[3]		670,000	[1]
Asset Transfers for Drop-Down and Simplification Transaction				(128,362)
Parent Net Investment at Dec. 31, 2019		0		0
Increase (Decrease) in Partners' Capital [Roll Forward]
Net Income		245,467		12,929		72,542	123,662		22,367		13,967
Contributions from Noncontrolling Interests		55,481				55,481
Distributions to Noncontrolling Interests	[3]	(80,992)				(26,103)
Distributions to Unitholders		(115,935)					(80,480)		(19,067)		(16,388)
Black Diamond Equity Ownership Promote Vesting	[2]					(20,391)	17,645		2,746
Conversion of Subordinated Units to Common Units	[4]						(124,161)		124,161
Preferred Equity Accretion		(9,440)					(9,440)
Preferred Equity Accretion		242,770					242,770
Distributions to Noble		670,000	[1]	$ 54,889	[3]		670,000	[1]
Asset Transfers for Drop-Down and Simplification Transaction						(484,825)	613,187
Unit-Based Compensation and Other		950					950
Ending Balance at Dec. 31, 2019		$ 1,154,856				$ 340,857	$ 813,999		$ 0		$ 0

[1] See Note 3. Transactions with Affiliates for further discussion of our common control transactions.

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

[3] Includes the elimination of a deferred tax asset and current tax liability associated with the Drop-Down and Simplification Transaction. See Note 2. Summary of Significant Accounting Policies and Basis of Presentation for further discussion.

[4] See Note 12. Partnership Distributions for further discussion on the conversion of Subordinated Units.