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Fair Value of Assets and Liabilities (Details) - USD ($) | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Apr. 18, 2016 | Sep. 25, 2014 | Oct. 03, 2013 | Mar. 19, 2013 | Feb. 10, 2011
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents | $ 31,255,000 |  | $ 81,377,000 | $ 68,038,000 |  |  |  |  |
5.875% Senior Notes due 2024 | Senior Notes |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  | $ 250,000,000.0 |  |  |
Stated interest rate | 5.875% |  | 5.875% |  |  | 5.875% |  |  |
5.125% Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  | $ 300,000,000.0 |
Stated interest rate | 5.125% |  | 5.125% |  |  |  |  | 5.125% |
5.875% Senior Notes due 2022 | Senior Notes |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  | $ 250,000,000.0 |  |
Stated interest rate | 5.875% |  | 5.875% |  |  |  |  |  |
6.625% Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  |  |  |  |  | $ 300,000,000
Stated interest rate | 6.625% |  | 6.625% |  |  |  |  | 6.00% | 6.625%
6.00% Senior Notes | Senior Notes |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Debt instrument, face amount |  |  |  |  | $ 350,000,000 |  |  |  |
Stated interest rate | 6.00% |  |  |  | 6.00% |  |  |  |
Carrying Value |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | $ 31,255,000 | $ 81,377,000 |  |  |  |  |  |
Restricted cash and investments |  | 53,217,000 | 52,168,000 |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Borrowings under the Senior Credit Facility |  | 1,273,965,000 | 1,064,599,000 |  |  |  |  |  |
Non-recourse debt |  | 340,910,000 | 393,737,000 |  |  |  |  |  |
Carrying Value | 5.875% Senior Notes due 2024 |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 250,000,000 | 250,000,000 |  |  |  |  |  |
Carrying Value | 5.125% Senior Notes |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 300,000,000 | 300,000,000 |  |  |  |  |  |
Carrying Value | 5.875% Senior Notes due 2022 |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 250,000,000 | 250,000,000 |  |  |  |  |  |
Carrying Value | 6.00% Senior Notes |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 350,000,000 | 350,000,000 |  |  |  |  |  |
Fair Value |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 31,255,000 | 81,377,000 |  |  |  |  |  |
Restricted cash and investments |  | 53,217,000 | 52,168,000 |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Borrowings under the Senior Credit Facility |  | 1,188,196,000 | 1,070,514,000 |  |  |  |  |  |
Non-recourse debt |  | 348,274,000 | 394,671,000 |  |  |  |  |  |
Fair Value | 5.875% Senior Notes due 2024 |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 224,590,000 | 262,095,000 |  |  |  |  |  |
Fair Value | 5.125% Senior Notes |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 271,992,000 | 303,918,000 |  |  |  |  |  |
Fair Value | 5.875% Senior Notes due 2022 |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 244,550,000 | 258,338,000 |  |  |  |  |  |
Fair Value | 6.00% Senior Notes |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 310,177,000 | 362,835,000 |  |  |  |  |  |
Level 1 | Fair Value |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 31,255,000 | 81,377,000 |  |  |  |  |  |
Restricted cash and investments |  | 50,499,000 | 49,884,000 |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Borrowings under the Senior Credit Facility |  | 0 | 0 |  |  |  |  |  |
Non-recourse debt |  | 0 | 0 |  |  |  |  |  |
Level 1 | Fair Value | 5.875% Senior Notes due 2024 |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 0 | 0 |  |  |  |  |  |
Level 1 | Fair Value | 5.125% Senior Notes |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 0 | 0 |  |  |  |  |  |
Level 1 | Fair Value | 5.875% Senior Notes due 2022 |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 0 | 0 |  |  |  |  |  |
Level 1 | Fair Value | 6.00% Senior Notes |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 0 |  |  |  |  |  |  |
Level 2 | Fair Value |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 0 | 0 |  |  |  |  |  |
Restricted cash and investments |  | 2,718,000 | 2,284,000 |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Borrowings under the Senior Credit Facility |  | 1,188,196,000 | 1,070,514,000 |  |  |  |  |  |
Non-recourse debt |  | 348,274,000 | 394,671,000 |  |  |  |  |  |
Level 2 | Fair Value | 5.875% Senior Notes due 2024 |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 224,590,000 | 262,095,000 |  |  |  |  |  |
Level 2 | Fair Value | 5.125% Senior Notes |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 271,992,000 | 303,918,000 |  |  |  |  |  |
Level 2 | Fair Value | 5.875% Senior Notes due 2022 |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 244,550,000 | 258,338,000 |  |  |  |  |  |
Level 2 | Fair Value | 6.00% Senior Notes |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 310,177,000 | 362,835,000 |  |  |  |  |  |
Level 3 | Fair Value |  |  |  |  |  |  |  |  |
Assets: |  |  |  |  |  |  |  |  |
Cash and cash equivalents |  | 0 | 0 |  |  |  |  |  |
Restricted cash and investments |  | 0 | 0 |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Borrowings under the Senior Credit Facility |  | 0 | 0 |  |  |  |  |  |
Non-recourse debt |  | 0 | 0 |  |  |  |  |  |
Level 3 | Fair Value | 5.875% Senior Notes due 2024 |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 0 | 0 |  |  |  |  |  |
Level 3 | Fair Value | 5.125% Senior Notes |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 0 | 0 |  |  |  |  |  |
Level 3 | Fair Value | 5.875% Senior Notes due 2022 |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | 0 | $ 0 |  |  |  |  |  |
Level 3 | Fair Value | 6.00% Senior Notes |  |  |  |  |  |  |  |  |
Liabilities: |  |  |  |  |  |  |  |  |
Senior notes, fair value |  | $ 0 |  |  |  |  |  |  |

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