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Fair Value of Assets and Liabilities - Carrying Values and Fair Values (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Assets: |  |  |
Cash and cash equivalents | $ 67,728 | $ 31,255 | $ 49,235
Carrying Value |  |  |
Assets: |  |  |
Cash and cash equivalents | 67,728 | 31,255 |
Restricted cash and investments | 56,077 | 53,217 |
Liabilities: |  |  |
Borrowings under senior credit facility | 1,311,175 | 1,273,965 |
Non-recourse debt | 341,196 | 340,910 |
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 | 67,728 | 31,255 |
Restricted cash and investments | 56,077 | 53,217 |
Liabilities: |  |  |
Borrowings under senior credit facility | 1,252,400 | 1,188,196 |
Non-recourse debt | 341,595 | 348,274 |
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2024 |  |  |
Liabilities: |  |  |
Senior notes | 219,278 | 224,590 |
Estimate of Fair Value Measurement | 5.125% Senior Notes |  |  |
Liabilities: |  |  |
Senior notes | 266,034 | 271,992 |
Estimate of Fair Value Measurement | 5.875% Senior Notes due 2022 |  |  |
Liabilities: |  |  |
Senior notes | 242,853 | 244,550 |
Estimate of Fair Value Measurement | 6.00% Senior Notes |  |  |
Liabilities: |  |  |
Senior notes | 294,914 | 310,177 |
Estimate of Fair Value Measurement | Level 1 |  |  |
Assets: |  |  |
Cash and cash equivalents | 67,728 | 31,255 |
Restricted cash and investments | 53,148 | 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 | 2,929 | 2,284 |
Liabilities: |  |  |
Borrowings under senior credit facility | 1,252,400 | 1,188,196 |
Non-recourse debt | 341,595 | 348,274 |
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2024 |  |  |
Liabilities: |  |  |
Senior notes | 219,278 | 224,590 |
Estimate of Fair Value Measurement | Level 2 | 5.125% Senior Notes |  |  |
Liabilities: |  |  |
Senior notes | 266,034 | 271,992 |
Estimate of Fair Value Measurement | Level 2 | 5.875% Senior Notes due 2022 |  |  |
Liabilities: |  |  |
Senior notes | 242,853 | 244,550 |
Estimate of Fair Value Measurement | Level 2 | 6.00% Senior Notes |  |  |
Liabilities: |  |  |
Senior notes | 294,914 | 310,177 |
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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