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Summary of Significant Accounting Policies - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jun. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Costs related to shareholder activism | $ 0 | $ 19,369 | $ 0 | $ 19,369 | $ 0 |  |
Distributions in excess of co-venture obligation | 0 |  |  | 0 |  |  | $ 31,150
Financing arrangement obligation | 384,431 |  |  | 384,431 |  |  | 0
Accumulated deficit | (1,520,209) |  |  | (1,520,209) |  |  | $ (830,279)
Capitalized internal leasing costs | $ 5,141 |  | $ 5,376 | 16,928 | 17,075 |  |
Increase in net cash provided by investing activities |  |  |  | $ 256,159 | 164,691 |  |
ASU 2016-18 |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Increase in net cash provided by investing activities |  |  |  |  | $ 785 |  |
Joint Venture | Chandler Freehold | Difference between revenue guidance in effect before and after topic 606 | ASU 2014-09 | Financing Arrangement |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Financing arrangement obligation |  |  |  |  |  | $ 393,709 |
Accumulated deficit |  |  |  |  |  | 424,859 |
Joint Venture | Chandler Freehold |  |  |  |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |  |  |  |
Distributions in excess of co-venture obligation |  |  |  |  |  | $ 31,150 |

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