Financial Instruments - Restricted Cash (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Variable Interest Entity [Line Items]
Restricted cash, current	[1]	$ 52,470	$ 30,804
Restricted cash, non-current	[1]	117,293	143,761
Restricted cash, total		169,763	174,565
Consolidated Entity, Excluding VIEs
Variable Interest Entity [Line Items]
Restricted cash, current		26,706	28,494
Restricted cash, non-current		286	10
PPA Entities
Variable Interest Entity [Line Items]
Restricted cash, current		4,698	2,244
Restricted cash, non-current		15,320	15,045
PPA Entities | PPA II
Variable Interest Entity [Line Items]
Restricted cash, current		20,300
Restricted cash, non-current		88,400	108,700
Restricted cash, total		108,700
PPA Entities | PPA IIIb
Variable Interest Entity [Line Items]
Restricted cash, current		700
Restricted cash, non-current		13,300	20,000
PPA Entities | Power Purchase Agreements Entities
Variable Interest Entity [Line Items]
Restricted cash, current		25,764	2,310
Restricted cash, non-current		$ 117,007	$ 143,751

[1] We have variable interest entities, which represent a portion of the consolidated balances recorded within these financial statement line items in the consolidated balance sheets (see Note 13 - Portfolio Financings).