Indebtedness - Schedule of Debt (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
Mar. 31, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Unused Borrowing Capacity	$ 10,206	$ 18,738
Interest Rate	4.03%
Maturity Date	Sep. 30, 2022
Long term debt, Current	$ 15,797	14,153
Long term debt, Noncurrent	933,478	883,870
Long term debt	$ 949,275	$ 898,023
Line of Credit \| Minimum \| Basis point
Debt Instrument [Line Items]
Interest Rate	3.35%	2.93%
Line of Credit \| Maximum \| Basis point
Debt Instrument [Line Items]
Interest Rate	3.54%	3.39%
Notes Payable
Debt Instrument [Line Items]
Maturity Date	Dec. 31, 2018
Bank Line of Credit
Debt Instrument [Line Items]
Maturity Date	Apr. 30, 2018
Recourse debt, Long Term	$ 247,400	$ 244,000
Recourse debt, Total	247,400	244,000
Recourse Debt
Debt Instrument [Line Items]
Unused Borrowing Capacity	6	3,406
Long term debt, Noncurrent	247,400	244,000
Long term debt	247,400	244,000
Recourse Debt \| Bank Line of Credit
Debt Instrument [Line Items]
Unused Borrowing Capacity	$ 6	$ 3,406
Maturity Date	Apr. 30, 2018	Apr. 30, 2018
Recourse Debt \| Bank Line of Credit \| Base Rate
Debt Instrument [Line Items]
Annual Contractual Interest Rate	2.25%	2.25%
Recourse Debt \| Bank Line of Credit \| Basis point
Debt Instrument [Line Items]
Annual Contractual Interest Rate	3.25%	3.25%
Recourse Debt \| Bank Line of Credit \| Minimum \| Base Rate
Debt Instrument [Line Items]
Interest Rate	4.19%	3.96%
Recourse Debt \| Bank Line of Credit \| Maximum \| Base Rate
Debt Instrument [Line Items]
Interest Rate	6.25%	5.75%
Non Recourse Debt
Debt Instrument [Line Items]
Unused Borrowing Capacity	$ 10,200	$ 15,332
Maturity Date	Jul. 31, 2021
Long term debt, Current	$ 15,797	14,153
Long term debt, Noncurrent	686,078	639,870
Long term debt	$ 701,875	654,023
Non Recourse Debt \| Basis point
Debt Instrument [Line Items]
Annual Contractual Interest Rate	3.00%
Non Recourse Debt \| Line of Credit
Debt Instrument [Line Items]
Unused Borrowing Capacity	$ 5,200	$ 9,300
Maturity Date	Dec. 31, 2020	Dec. 31, 2020
Long term debt, Noncurrent	$ 278,900	$ 245,200
Long term debt	$ 278,900	$ 245,200
Non Recourse Debt \| Line of Credit \| Basis point
Debt Instrument [Line Items]
Annual Contractual Interest Rate	2.50%	2.50%
Non Recourse Debt \| Term Loan A
Debt Instrument [Line Items]
Unused Borrowing Capacity	$ 5,000	$ 5,000
Maturity Date	Dec. 31, 2021	Dec. 31, 2021
Long term debt, Current	$ 575	$ 616
Long term debt, Noncurrent	145,854	146,387
Long term debt	$ 146,429	$ 147,003
Non Recourse Debt \| Term Loan A \| Basis point
Debt Instrument [Line Items]
Interest Rate	3.79%	3.64%
Annual Contractual Interest Rate	2.75%	2.75%
Non Recourse Debt \| Term Loan and Term Loan B
Debt Instrument [Line Items]
Interest Rate		6.00%
Maturity Date		Dec. 31, 2021
Long term debt, Current	$ 116	$ 116
Long term debt, Noncurrent	42,618	42,870
Long term debt	$ 42,734	$ 42,986
Non Recourse Debt \| Term Loan and Term Loan B \| Basis point
Debt Instrument [Line Items]
Interest Rate	6.04%	6.00%
Annual Contractual Interest Rate	5.00%	5.00%
Non Recourse Debt \| Bank term loan due in September 2022
Debt Instrument [Line Items]
Interest Rate	3.03%	2.86%
Maturity Date	Sep. 30, 2022	Sep. 30, 2022
Long term debt, Current	$ 1,504	$ 1,074
Long term debt, Noncurrent	33,015	21,249
Long term debt	$ 34,519	$ 22,323
Non Recourse Debt \| Bank term loan due in September 2022 \| Basis point
Debt Instrument [Line Items]
Annual Contractual Interest Rate	2.25%	2.25%
Non Recourse Debt \| Bank term loan due in April 2022
Debt Instrument [Line Items]
Interest Rate	4.50%	4.50%
Maturity Date	Apr. 30, 2022	Apr. 30, 2022
Long term debt, Current	$ 1,372	$ 1,331
Long term debt, Noncurrent	25,886	26,565
Long term debt	$ 27,258	$ 27,896
Non Recourse Debt \| Bank term loan due in April 2022 \| Basis point
Debt Instrument [Line Items]
Interest Rate	4.50%	4.50%
Non Recourse Debt \| Solar Asset Backed Securities Class A
Debt Instrument [Line Items]
Interest Rate	4.40%	4.40%
Maturity Date	Jul. 31, 2024	Jul. 31, 2024
Long term debt, Current	$ 3,789	$ 3,730
Long term debt, Noncurrent	96,402	97,565
Long term debt	100,191	101,295
Non Recourse Debt \| Bank term loan due in July 2021
Debt Instrument [Line Items]
Unused Borrowing Capacity		$ 1,032
Maturity Date		Jul. 31, 2021
Long term debt, Current	8,441	$ 7,286
Long term debt, Noncurrent	26,040	23,802
Long term debt	$ 34,481	$ 31,088
Non Recourse Debt \| Bank term loan due in July 2021 \| Minimum
Debt Instrument [Line Items]
Interest Rate	6.55%	6.25%
Non Recourse Debt \| Bank term loan due in July 2021 \| Maximum
Debt Instrument [Line Items]
Interest Rate	10.05%	9.94%
Non Recourse Debt \| Notes Payable
Debt Instrument [Line Items]
Interest Rate	12.00%	12.00%
Maturity Date	Dec. 31, 2018	Dec. 31, 2018
Long term debt, Noncurrent	$ 37,363	$ 36,232
Long term debt	$ 37,363	$ 36,232
Non Recourse Debt \| Year One \| Term Loan and Term Loan B
Debt Instrument [Line Items]
Maturity Date	Dec. 31, 2020	Dec. 31, 2020
Non Recourse Debt \| Solar Asset Backed Securities Class B
Debt Instrument [Line Items]
Interest Rate	5.38%	5.38%
Maturity Date	Jul. 31, 2024	Jul. 31, 2024

Recourse debt.

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- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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Amount of unused borrowing capacity under the long-term financing arrangement that is available to the entity as of the balance sheet date.

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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
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-Name Accounting Standards Codification
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-Section S99
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- Definition

Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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- Definition

The carrying value as of the balance sheet date of the noncurrent portion of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
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-Section 45
-Paragraph 13
-URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1314-112600

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-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=28361426&loc=d3e1336-112600

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=6517033

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