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Power Purchase Agreement Programs - Schedule of Consolidated Assets and Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Variable Interest Entity [Line Items]    
Current assets $ 698,532 $ 419,981
Long-term assets 746,613 801,006
Total assets 1,445,145 1,220,987
Current liabilities 249,931 251,148
Current portion of debt 21,922 20,136
Long-term liabilities 348,083 529,135
Long-term portion of debt 718,889 921,205
Total liabilities 1,338,825 1,721,624
Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Current assets 27,348 36,772
Long-term assets 507,799 533,656
Total assets 535,147 570,428
Current liabilities 2,480 3,684
Current portion of debt 20,235 18,446
Long-term liabilities 12,376 15,768
Long-term portion of debt 328,358 342,050
Total liabilities 363,449 379,948
Bloom    
Variable Interest Entity [Line Items]    
Current assets 671,184 383,209
Long-term assets 238,814 267,350
Total assets 909,998 650,559
Current liabilities 247,451 247,464
Current portion of debt 1,687 1,690
Long-term liabilities 335,707 513,367
Long-term portion of debt 390,531 579,155
Total liabilities $ 975,376 $ 1,341,676