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Equity and Capital - Terms and Conditions of Preferred and Common Stock (Details) | 1 Months Ended | 12 Months Ended | 24 Months Ended |  |
--- | --- | --- | --- | --- | ---
Feb. 26, 2018 USD ($) | Feb. 04, 2020 | Dec. 31, 2018 USD ($) shares | Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) | Feb. 06, 2020 | Feb. 05, 2019 USD ($) | Feb. 07, 2018 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Amount avaiable for issuance |  |  | $ 500,000,000 |  |  |  |  |
Document Fiscal Year Focus |  |  | 2018 |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  |  | $ 250,000,000
Stock Repurchase Program Expiration Date |  |  |  |  |  | Feb. 06, 2020 |  |
Stock Repurchased During Period, Value | $ 246,500,000 |  |  |  |  |  |  |
Partnership Interest [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued | shares |  |  | 0 | 0 |  |  |  |
Parent Company [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Preferred Stock, Shares Issued | shares |  |  | 0 | 0 |  |  |  |
Net proceeds from common stock issuance |  |  | $ 0 | $ 88,458,000 | $ 548,920,000 |  |  |
Conversion of Stock, Conversion Ratio |  |  | 0.45 |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions | shares |  |  | 65,500,000 |  |  |  |  |
Maximum [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Amount avaiable for issuance |  |  | $ 500,000,000 |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |
Stock Repurchase Program, Number of Shares Authorized to be Repurchased |  |  |  |  |  |  | $ 250,000,000 |
Stock Repurchase Program Expiration Date |  | Feb. 04, 2020 |  |  |  |  |  |

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