Debt and Interest Expense - Interest Expense Table (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Interest expense	[1]	$ (186,043)	$ (144,615)	$ (116,628)
Third Parties [Member]
Debt Instrument [Line Items]
Long-term and short-term debt		(200,454)	(143,400)	(122,428)
Amortization of debt issuance costs and commitment fees		(9,110)	(7,970)	(7,509)
Capitalized interest		23,521	6,826	5,562
Interest expense		(186,043)	(144,544)	(124,375)
Affiliates [Member]
Debt Instrument [Line Items]
Interest expense	[2]	0	(71)	7,747
Affiliates [Member] | Deferred Purchase Price Obligation - Anadarko [Member]
Debt Instrument [Line Items]
Deferred purchase price obligation - Anadarko	[3]	$ 0	$ (71)	$ 7,747

[1] Includes affiliate (as defined in Note 1) amounts of zero, $(0.1) million and $7.7 million for the years ended December 31, 2018, 2017 and 2016, respectively. See Note 3 and Note 13.

[2] Includes amounts related to the Deferred purchase price obligation - Anadarko (see Note 3 and Note 13).

[3] See Note 3 for a discussion of the Deferred purchase price obligation - Anadarko.