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Fair Value Measurements - Schedule of Assets Measured at Fair Value on a Recurring Basis (Details) - Fair Value Recurring Basis - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Assets: |  |
Restricted cash and investments | $ 43,000 | $ 42,000
Marketable securities | 61,000 | 35,000
Total assets at fair value | 104,000 | 77,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Other liabilities related to restricted investments | 4,000 |
Total liabilities at fair value | 693,000 |
5% Convertible notes |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative instruments | 575,000 |
Interest Rate Swaps and FX Forward |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative instruments | 114,000 |
Fair Value, Inputs, Level 1 |  |
Assets: |  |
Restricted cash and investments | 8,000 | 11,000
Marketable securities | 31,000 | 27,000
Total assets at fair value | 39,000 | 38,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Other liabilities related to restricted investments | 0 |
Total liabilities at fair value | 0 |
Fair Value, Inputs, Level 1 | 5% Convertible notes |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative instruments | 0 |
Fair Value, Inputs, Level 1 | Interest Rate Swaps and FX Forward |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative instruments | 0 |
Fair Value, Inputs, Level 2 |  |
Assets: |  |
Restricted cash and investments | 3,000 | 2,000
Marketable securities | 12,000 | 8,000
Total assets at fair value | 15,000 | 10,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Other liabilities related to restricted investments | 0 |
Total liabilities at fair value | 689,000 |
Fair Value, Inputs, Level 2 | 5% Convertible notes |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative instruments | 575,000 |
Fair Value, Inputs, Level 2 | Interest Rate Swaps and FX Forward |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative instruments | 114,000 |
Fair Value, Inputs, Level 3 |  |
Assets: |  |
Restricted cash and investments | 50,000 | 29,000
Marketable securities | 0 | 0
Total assets at fair value | 50,000 | $ 29,000
Liabilities, Fair Value Disclosure [Abstract] |  |
Other liabilities related to restricted investments | 4,000 |
Total liabilities at fair value | 4,000 |
Fair Value, Inputs, Level 3 | 5% Convertible notes |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative instruments | 0 |
Fair Value, Inputs, Level 3 | Interest Rate Swaps and FX Forward |  |
Liabilities, Fair Value Disclosure [Abstract] |  |
Derivative instruments | $ 0 |

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