Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cost of product	[1]	$ 444,247	$ 415,505	$ 953,792
Operation and maintenance	[1]	641,219	480,861	345,617
General and administrative	[1]	114,591	67,195	53,949
Interest expense	[2]	(303,286)	(183,831)	(142,520)
Affiliates [Member]
Cost of product		254,771	168,535	74,560
Operation and maintenance		146,990	115,948	82,249
General and administrative		101,485	49,672	43,221
Interest expense		$ (1,970)	$ (6,746)	$ (224)

[1] Cost of product includes product purchases from affiliates (as defined in Note 1) of $254.8 million, $168.5 million, and $74.6 million for the years ended December 31, 2019, 2018, and 2017, respectively. Operation and maintenance includes charges from affiliates of $147.0 million, $115.9 million, and $82.2 million for the years ended December 31, 2019, 2018, and 2017, respectively. General and administrative includes charges from affiliates of $101.5 million, $49.7 million, and $43.2 million for the years ended December 31, 2019, 2018, and 2017, respectively. See Note 6.

[2] Includes affiliate amounts of $(2.0) million, $(6.7) million, and $(0.2) million for the years ended December 31, 2019, 2018, and 2017, respectively. See Note 1 and Note 13.