Power Purchase Agreement Programs - Schedule of PPA Entities' Assets and Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2020		Dec. 31, 2019		Jun. 30, 2019
Current assets:
Cash and cash equivalents	$ 144,072	[1]	$ 202,823	[1]	$ 308,009
Restricted cash, current	40,393	[1]	30,804	[1]	23,706
Accounts receivable	49,614	[1]	37,828	[1]	40,038
Customer financing receivable	5,254	[1]	5,108	[1]	5,817
Total current assets	440,792		472,707		591,249
Property, plant and equipment, net	601,566	[1]	607,059	[1]	641,259
Non-current portion of investment in sales-type financing leases	48,111	[1]	50,747	[1]	64,146
Restricted cash, non-current	139,664	[1]	143,761	[1]	39,351
Other long-term assets	40,989	[1]	41,652	[1]	72,836
Total assets	1,277,543		1,322,591		1,412,687
Current liabilities:
Accrued expenses and other current liabilities	88,052	[1]	70,284	[1]	105,393
Deferred revenue and customer deposits	102,944	[1]	89,192	[1]	118,738
Current portion of debt	26,064		337,583
Total current liabilities	303,734		573,964		332,049
Derivative liabilities	22,281	[1]	17,551	[1]	18,175
Deferred revenue and customer deposits	114,684	[1]	125,529	[1]	110,750
Long-term portion of debt	619,655		299,229
Other long-term liabilities	27,276	[1]	28,013	[1]	29,979
Total liabilities	1,528,074		1,490,451		$ 1,533,014
PPA Entities
Current assets:
Cash and cash equivalents	4,600		1,894
Restricted cash, current	827		2,244
Accounts receivable	4,004		4,194
Customer financing receivable	5,254		5,108
Prepaid expenses and other current assets	1,030		3,587
Total current assets	15,715		17,027
Property, plant and equipment, net	263,793		275,481
Non-current portion of investment in sales-type financing leases	48,111		50,747
Restricted cash, non-current	15,123		15,045
Other long-term assets	241		607
Total assets	342,983		358,907
Current liabilities:
Accrued expenses and other current liabilities	2,312		1,391
Deferred revenue and customer deposits	662		662
Current portion of debt	11,366		12,155
Total current liabilities	14,340		14,208
Derivative liabilities	15,783		8,459
Deferred revenue and customer deposits	6,405		6,735
Long-term portion of debt	218,316		223,267
Other long-term liabilities	2,627		2,355
Total liabilities	$ 257,471		$ 255,024

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