Long-term Debt - Project-Level Narrative (Details) - USD ($)
$ in Thousands |
12 Months Ended |
|
Dec. 31, 2015 |
Dec. 31, 2014 |
| Debt Instrument [Line Items] |
|
|
|
| Long-term debt |
$ 1,295,761
|
|
$ 524,111
|
| Term debt | Project level |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Long-term debt |
368,900
|
|
374,100
|
| Term debt | Permanent financing |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Long-term debt |
$ 368,935
|
[1] |
$ 353,626
|
| Long-term debt, percentage bearing variable interest |
91.20%
|
|
|
| Term debt | Permanent financing | South Africa |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Long-term debt |
$ 122,100
|
|
|
| Long-term debt, amount bearing fixed interest |
$ 9,700
|
|
|
| Term debt | Permanent financing | South Africa | Minimum |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Long-term debt, percentage bearing variable interest |
12.29%
|
|
|
| Term debt | Permanent financing | South Africa | Maximum |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Long-term debt, percentage bearing variable interest |
13.03%
|
|
|
| Term debt | Permanent financing | India |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Long-term debt, amount bearing fixed interest |
$ 21,300
|
|
|
| Long-term debt, amount bearing variable interest |
$ 23,800
|
|
|
| Term debt | Permanent financing | India | Minimum |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Stated interest rate |
0.00%
|
|
|
| Term debt | Permanent financing | India | Maximum |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Stated interest rate |
12.00%
|
|
|
| Long-term debt, percentage bearing variable interest |
12.60%
|
|
|
| Term debt | Permanent financing | Boshof |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Long-term debt |
$ 184,600
|
|
|
| Term debt | Permanent financing | ESP Urja and Azure | India |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Long-term debt, amount bearing fixed interest |
$ 19,500
|
|
|
| Term debt | Permanent financing | ESP Urja and Azure | India | Matures September 2026 |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Stated interest rate |
4.70%
|
|
|
| Term debt | Permanent financing | ESP Urja and Azure | India | Matures December 2026 |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Stated interest rate |
4.50%
|
|
|
| Term debt | Permanent financing | India PSA |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Repayments of project-level indebtedness of projects in equity method investment |
$ 23,600
|
|
|
| Term debt | Permanent financing | LIBOR | South Africa |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Long-term debt, amount bearing variable interest |
306,900
|
|
|
| Term debt | Permanent financing | Kuala Lumpur Interbank Offered Rate | Malaysia |
|
|
|
| Debt Instrument [Line Items] |
|
|
|
| Long-term debt, amount bearing variable interest |
$ 5,900
|
|
|
| Long-term debt, percentage bearing variable interest |
6.50%
|
|
|
|
|