Debt and Interest Expense - Interest Expense Table (Details) - USD ($) $ in Thousands		3 Months Ended			6 Months Ended
		Jun. 30, 2019	Jun. 30, 2018		Jun. 30, 2019	Jun. 30, 2018
Debt Instrument [Line Items]
Finance lease liabilities		$ (20)			$ (20)
Interest expense	[1]	(79,472)	$ (42,245)	[2]	(145,348)	$ (80,260)	[2]
Third Parties [Member]
Debt Instrument [Line Items]
Long-term and short-term debt		(82,624)	(48,671)		(149,720)	(90,207)
Amortization of debt issuance costs and commitment fees		(3,170)	(2,037)		(6,322)	(4,901)
Capitalized interest		6,342	9,872		12,547	16,834
Interest expense		(79,452)	(40,836)		(143,495)	(78,274)
Affiliates [Member]
Debt Instrument [Line Items]
APCWH Note Payable		0	(1,409)		(1,833)	(1,986)
Finance lease liabilities		(20)	0		(20)	0
Interest expense		$ (20)	$ (1,409)		$ (1,853)	$ (1,986)

[1] Includes affiliate (as defined in Note 1) amounts of $0.02 million and $1.9 million for the three and six months ended June 30, 2019, respectively, and $1.4 million and $2.0 million for the three and six months ended June 30, 2018, respectively. See Note 1 and Note 10.

[2] Financial information has been recast to include the financial position and results attributable to AMA. See Note 1 and Note 3.