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Equity and Capital Equity and Capital - Common Stock (Details) - USD ($) |  |  | 12 Months Ended
--- | --- | --- | ---
Feb. 03, 2021 | Feb. 04, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  | $ 0 | $ (32,778,000) | $ (213,851,000)
Common stock remaining available for Issuance |  |  | 500,000,000 |  |
Common stock, shares issued |  |  | 169,680,138 | 167,571,218 |
Net proceeds from common stock issuance |  |  | $ 125,608,000 | $ 0 | 0
Stock Repurchase Program, Authorized Amount |  | $ 250,000,000 |  |  |
Stock Repurchase Program Expiration Date |  | Feb. 05, 2021 |  |  |
Common stock repurchased and retired |  |  | $ 0 | (32,778,000) | $ (213,851,000)
Subsequent Event [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock Repurchase Program, Authorized Amount | $ 250,000,000 |  |  |  |
Stock Repurchase Program Expiration Date | Feb. 03, 2023 |  |  |  |
ATM Equity Offering Program [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Shares issued under program |  |  |  |  | 0
Forward Equity Offering [Member] | ATM Equity Offering Program [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Common stock, shares issued |  |  | 1,894,845 |  |
Net proceeds from common stock issuance |  |  | $ 125,800,000 |  |
Maximum [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Equity Issuances, Common Shares Authorized for Issuance |  |  | 500,000,000.0 |  |
Common Stock [Member] |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Stock Repurchased and Retired During Period, Value |  |  |  | (6,000) | $ (37,000)
Common stock repurchased and retired |  |  |  | $ (6,000) | $ (37,000)

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