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Fair Value of Assets and Liabilities - Carrying Values and Fair Values (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
--- | --- | --- | ---
Assets: |  |  |
Cash and cash equivalents | $ 49,235 | $ 81,377 | $ 434,559
Carrying Value |  |  |
Assets: |  |  |
Cash and cash equivalents | 49,235 | 81,377 |
Restricted cash and investments | 60,014 | 52,168 |
Liabilities: |  |  |
Borrowings under senior credit facility | 1,122,155 | 1,064,599 |
Non-recourse debt | 382,647 | 393,737 |
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 |
Estimate of Fair Value Measurement |  |  |
Assets: |  |  |
Cash and cash equivalents | 49,235 | 81,377 |
Restricted cash and investments | 60,014 | 52,168 |
Liabilities: |  |  |
Borrowings under senior credit facility | 1,122,155 | 1,070,514 |
Non-recourse debt | 383,462 | 394,671 |
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2024 |  |  |
Liabilities: |  |  |
Senior notes | 250,505 | 262,095 |
Estimate of Fair Value Measurement | 5.125% Senior Notes |  |  |
Liabilities: |  |  |
Senior notes | 297,888 | 303,918 |
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2022 |  |  |
Liabilities: |  |  |
Senior notes | 257,330 | 258,338 |
Estimate of Fair Value Measurement | 6.00% Senior Notes |  |  |
Liabilities: |  |  |
Senior notes | 344,467 | 362,835 |
Estimate of Fair Value Measurement | Level 1 |  |  |
Assets: |  |  |
Cash and cash equivalents | 49,235 | 81,377 |
Restricted cash and investments | 57,289 | 49,884 |
Liabilities: |  |  |
Borrowings under senior credit facility | 0 | 0 |
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 2 |  |  |
Assets: |  |  |
Cash and cash equivalents | 0 | 0 |
Restricted cash and investments | 2,725 | 2,284 |
Liabilities: |  |  |
Borrowings under senior credit facility | 1,122,155 | 1,070,514 |
Non-recourse debt | 383,462 | 394,671 |
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2024 |  |  |
Liabilities: |  |  |
Senior notes | 250,505 | 262,095 |
Estimate of Fair Value Measurement | Level 2 | 5.125% Senior Notes |  |  |
Liabilities: |  |  |
Senior notes | 297,888 | 303,918 |
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2022 |  |  |
Liabilities: |  |  |
Senior notes | 257,330 | 258,338 |
Estimate of Fair Value Measurement | Level 2 | 6.00% Senior Notes |  |  |
Liabilities: |  |  |
Senior notes | 344,467 | 362,835 |
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 |
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 |

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