Investment Funds - Schedule of Future Minimum Lease Payments to be Received from Fund Investor (Details) $ in Thousands	Dec. 31, 2016 USD ($)
Schedule Of Investments [Line Items]
2017	$ 4,962
2018	5,106
2019	5,254
2020	5,406
2021	5,565
Solar Energy Systems
Schedule Of Investments [Line Items]
2017	2,953
2018	2,999
2019	3,045
2020	3,091
2021	3,138
Thereafter	7,184
Total minimum lease payments to be received	$ 22,410

Future minimum rental payments in aggregate as of the balance sheet date under operating leases.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6454179&loc=d3e41551-112718

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Future rental payments receivable within one year of the balance sheet date under an operating lease.

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Future rental payments receivable within the fifth year from the balance sheet date under an operating lease.

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Future minimum lease payments receivable under operating leases for periods greater than five years following the balance sheet date.

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