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Fair Value Measurements - Summary of Financial Instruments Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |  |  |
Unrestricted and restricted cash equivalents and investments, Estimated Fair Value | $ 1,816,559 |  | $ 2,792,161 |
Fair Value Measurements on a Recurring Basis |  |  |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |  |  |
Total unrestricted cash equivalents and short-term investments at fair value | 706,777 | [1] | 1,789,842 | [2]
Total restricted cash equivalents and investments at fair value | 1,109,782 | [3] | 1,002,319 | [4]
Unrestricted and restricted cash equivalents and investments, Estimated Fair Value | 1,816,559 |  | 2,792,161 |
Fair Value Measurements on a Recurring Basis | Level 1 |  |  |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |  |  |
Total unrestricted cash equivalents and short-term investments at fair value | 1,406 | [1] | 38,528 | [2]
Total restricted cash equivalents and investments at fair value | 2,822 | [3] | 4,620 | [4]
Unrestricted and restricted cash equivalents and investments, Estimated Fair Value | 4,228 |  | 43,148 |
Fair Value Measurements on a Recurring Basis | Level 2 |  |  |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |  |  |
Total unrestricted cash equivalents and short-term investments at fair value | 705,371 | [1] | 1,751,314 | [2]
Total restricted cash equivalents and investments at fair value | 1,106,960 | [3] | 997,699 | [4]
Unrestricted and restricted cash equivalents and investments, Estimated Fair Value | 1,812,331 |  | 2,749,013 |
Fair Value Measurements on a Recurring Basis | Money Market Funds |  |  |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |  |  |
Total unrestricted cash equivalents and short-term investments at fair value | 1,406 | [1] | 38,528 | [2]
Total restricted cash equivalents and investments at fair value | 2,822 | [3] | 4,620 | [4]
Fair Value Measurements on a Recurring Basis | Money Market Funds | Level 1 |  |  |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |  |  |
Total unrestricted cash equivalents and short-term investments at fair value | 1,406 | [1] | 38,528 | [2]
Total restricted cash equivalents and investments at fair value | 2,822 | [3] | 4,620 | [4]
Fair Value Measurements on a Recurring Basis | Certificates of Deposit |  |  |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |  |  |
Total unrestricted cash equivalents and short-term investments at fair value | 168,903 | [1] | 497,554 | [2]
Total restricted cash equivalents and investments at fair value | 348,369 | [3] | 307,604 | [4]
Fair Value Measurements on a Recurring Basis | Certificates of Deposit | Level 2 |  |  |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |  |  |
Total unrestricted cash equivalents and short-term investments at fair value | 168,903 | [1] | 497,554 | [2]
Total restricted cash equivalents and investments at fair value | 348,369 | [3] | 307,604 | [4]
Fair Value Measurements on a Recurring Basis | Commercial Paper |  |  |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |  |  |
Total unrestricted cash equivalents and short-term investments at fair value | 441,961 | [1] | 1,134,721 | [2]
Total restricted cash equivalents and investments at fair value | 696,337 | [3] | 624,509 | [4]
Fair Value Measurements on a Recurring Basis | Commercial Paper | Level 2 |  |  |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |  |  |
Total unrestricted cash equivalents and short-term investments at fair value | 441,961 | [1] | 1,134,721 | [2]
Total restricted cash equivalents and investments at fair value | 696,337 | [3] | 624,509 | [4]
Corporate Bonds | Fair Value Measurements on a Recurring Basis |  |  |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |  |  |
Total unrestricted cash equivalents and short-term investments at fair value | 94,507 | [1] | 119,039 | [2]
Total restricted cash equivalents and investments at fair value | 62,254 | [3] | 65,586 | [4]
Corporate Bonds | Fair Value Measurements on a Recurring Basis | Level 2 |  |  |  |
Financial Instruments Measured at Fair Value on a Recurring Basis [Line Items] |  |  |  |
Total unrestricted cash equivalents and short-term investments at fair value | 94,507 | [1] | 119,039 | [2]
Total restricted cash equivalents and investments at fair value | $ 62,254 | [3] | $ 65,586 | [4]
[1] | Included in cash and cash equivalents and short-term investments in the Company’s condensed consolidated balance sheet as of March 31, 2019 in addition to $328.1 million of cash
[2] | Included in cash and cash equivalents and short-term investments in the Company’s condensed consolidated balance sheet as of December 31, 2018 in addition to $248.0 million of cash.
[3] | Included in restricted cash and cash equivalents and restricted investments in the Company’s condensed consolidated balance sheet as of March 31, 2019 in addition to $58.0 million of restricted cash.
[4] | Included in restricted cash and cash equivalents and restricted investments in the Company’s condensed consolidated balance sheet as of December 31, 2018 in addition to $50.2 million of restricted cash.

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