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Fair Value of Assets and Liabilities - Carrying Values and Fair Values (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | ---
Assets: |  |  |  |
Cash and cash equivalents | $ 51,526 | $ 68,038 | $ 30,123 | $ 59,638
Carrying Value |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 51,526 | 68,038 |  |
Restricted cash and investments | 24,012 | 22,319 |  |
Liabilities: |  |  |  |
Borrowings under senior credit facility | 1,041,874 | 804,500 |  |
Carrying Value | Subsidiary | AUSTRALIA |  |  |  |
Liabilities: |  |  |  |
Non-recourse debt | 549,926 | 454,222 |  |
Carrying Value | 5.875% Senior Notes due 2024 |  |  |  |
Liabilities: |  |  |  |
Senior notes | 250,000 | 250,000 |  |
Carrying Value | 5.125% Senior Notes |  |  |  |
Liabilities: |  |  |  |
Senior notes | 300,000 | 300,000 |  |
Carrying Value | 5.875% Senior Notes due 2022 |  |  |  |
Liabilities: |  |  |  |
Senior notes | 250,000 | 250,000 |  |
Carrying Value | 6.00% Senior Notes |  |  |  |
Liabilities: |  |  |  |
Senior notes | 350,000 | 350,000 |  |
Carrying Value | Other non-recourse debt, including current portion |  |  |  |
Liabilities: |  |  |  |
Non-recourse debt | 36,381 | 36,280 |  |
Estimate of Fair Value Measurement |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 51,526 | 68,038 |  |
Restricted cash and investments | 24,012 | 22,319 |  |
Liabilities: |  |  |  |
Borrowings under senior credit facility | 1,047,844 | 795,008 |  |
Estimate of Fair Value Measurement | Subsidiary | AUSTRALIA |  |  |  |
Liabilities: |  |  |  |
Non-recourse debt | 549,926 | 454,185 |  |
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2024 |  |  |  |
Liabilities: |  |  |  |
Senior notes | 260,943 | 247,813 |  |
Estimate of Fair Value Measurement | 5.125% Senior Notes |  |  |  |
Liabilities: |  |  |  |
Senior notes | 305,418 | 292,125 |  |
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2022 |  |  |  |
Liabilities: |  |  |  |
Senior notes | 260,985 | 254,688 |  |
Estimate of Fair Value Measurement | 6.00% Senior Notes |  |  |  |
Liabilities: |  |  |  |
Senior notes | 368,571 | 346,938 |  |
Estimate of Fair Value Measurement | Other non-recourse debt, including current portion |  |  |  |
Liabilities: |  |  |  |
Non-recourse debt | 37,465 | 37,550 |  |
Estimate of Fair Value Measurement | Level 1 |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 51,526 | 68,038 |  |
Restricted cash and investments | 20,592 | 19,614 |  |
Liabilities: |  |  |  |
Borrowings under senior credit facility | 0 | 0 |  |
Estimate of Fair Value Measurement | Level 1 | Subsidiary | AUSTRALIA |  |  |  |
Liabilities: |  |  |  |
Non-recourse debt | 0 | 0 |  |
Estimate of Fair Value Measurement | Level 1 | 5.875% Senior Notes due 2024 |  |  |  |
Liabilities: |  |  |  |
Senior notes | 0 | 0 |  |
Estimate of Fair Value Measurement | Level 1 | 5.125% Senior Notes |  |  |  |
Liabilities: |  |  |  |
Senior notes | 0 | 0 |  |
Estimate of Fair Value Measurement | Level 1 | 5.875% Senior Notes due 2022 |  |  |  |
Liabilities: |  |  |  |
Senior notes | 0 | 0 |  |
Estimate of Fair Value Measurement | Level 1 | 6.00% Senior Notes |  |  |  |
Liabilities: |  |  |  |
Senior notes | 0 | 0 |  |
Estimate of Fair Value Measurement | Level 1 | Other non-recourse debt, including current portion |  |  |  |
Liabilities: |  |  |  |
Non-recourse debt | 0 | 0 |  |
Estimate of Fair Value Measurement | Level 2 |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Restricted cash and investments | 3,420 | 2,705 |  |
Liabilities: |  |  |  |
Borrowings under senior credit facility | 1,047,844 | 795,008 |  |
Estimate of Fair Value Measurement | Level 2 | Subsidiary | AUSTRALIA |  |  |  |
Liabilities: |  |  |  |
Non-recourse debt | 549,926 | 454,185 |  |
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2024 |  |  |  |
Liabilities: |  |  |  |
Senior notes | 260,943 | 247,813 |  |
Estimate of Fair Value Measurement | Level 2 | 5.125% Senior Notes |  |  |  |
Liabilities: |  |  |  |
Senior notes | 305,418 | 292,125 |  |
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2022 |  |  |  |
Liabilities: |  |  |  |
Senior notes | 260,985 | 254,688 |  |
Estimate of Fair Value Measurement | Level 2 | 6.00% Senior Notes |  |  |  |
Liabilities: |  |  |  |
Senior notes | 368,571 | 346,938 |  |
Estimate of Fair Value Measurement | Level 2 | Other non-recourse debt, including current portion |  |  |  |
Liabilities: |  |  |  |
Non-recourse debt | 37,465 | 37,550 |  |
Estimate of Fair Value Measurement | Level 3 |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 0 | 0 |  |
Restricted cash and investments | 0 | 0 |  |
Liabilities: |  |  |  |
Borrowings under senior credit facility | 0 | 0 |  |
Estimate of Fair Value Measurement | Level 3 | Subsidiary | AUSTRALIA |  |  |  |
Liabilities: |  |  |  |
Non-recourse debt | 0 | 0 |  |
Estimate of Fair Value Measurement | Level 3 | 5.875% Senior Notes due 2024 |  |  |  |
Liabilities: |  |  |  |
Senior notes | 0 | 0 |  |
Estimate of Fair Value Measurement | Level 3 | 5.125% Senior Notes |  |  |  |
Liabilities: |  |  |  |
Senior notes | 0 | 0 |  |
Estimate of Fair Value Measurement | Level 3 | 5.875% Senior Notes due 2022 |  |  |  |
Liabilities: |  |  |  |
Senior notes | 0 | 0 |  |
Estimate of Fair Value Measurement | Level 3 | 6.00% Senior Notes |  |  |  |
Liabilities: |  |  |  |
Senior notes | 0 | 0 |  |
Estimate of Fair Value Measurement | Level 3 | Other non-recourse debt, including current portion |  |  |  |
Liabilities: |  |  |  |
Non-recourse debt | $ 0 | $ 0 |  |

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