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Equity - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 4 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Feb. 29, 2020 | Nov. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2019 | Mar. 31, 2020 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net |  |  |  | $ 511 |  | $ 102,429 | $ 1,060,000 | $ 1,065,900 | $ 509,242 |
At-The-Market Program |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Option indexed to issuers equity, term |  |  |  |  |  |  |  | 1 year |  |
2019 ATM Program |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum shares issuable under forward equity sales agreement (in shares) |  |  |  |  |  | 1,200,000 |  | 2,000,000.0 | 14,800,000 |
Forward equity sales agreement, initial net price (in usd per share) |  |  |  |  |  | $ 31.10 |  | $ 35.23 | $ 31.23 |
2019 ATM Program, Settled |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Share settlement (in shares) |  |  |  |  | 16,800,000 | 5,500,000 | 16,800,000 |  | 5,500,000 |
Weighted average settlement price (in usd per share) |  |  |  |  | $ 31.38 |  |  |  | $ 30.91 |
Issuance of common stock, net |  |  |  |  | $ 528,000 |  |  |  | $ 171,000 |
Issuance of common stock, net (in shares) |  |  |  | 0 |  |  |  |  |  |
Remainder outstanding (in shares) |  |  |  | 0 |  |  |  | 0 |  |
ATM Direct Issuances |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average net price (in usd per share) |  |  |  |  |  | $ 31.84 |  |  | $ 31.84 |
ATM Direct Issuances | Common Stock |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common stock, net |  |  |  |  |  |  |  |  | $ 189,000 |
Issuance of common stock, net (in shares) |  |  |  | 0 |  |  |  | 0 | 5,900,000 |
2020 ATM Program |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
ATM aggregate amount authorized | $ 1,250,000 |  |  |  |  |  |  |  |  |
ATM aggregate amount remaining |  |  |  |  |  |  |  | $ 1,250,000 |  |
2019 Forward Equity Offering |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Maximum shares issuable under forward equity sales agreement (in shares) |  | 15,600,000 |  |  |  |  |  |  |  |
Forward equity sales agreement, initial net price (in usd per share) |  | $ 34.46 |  |  |  |  |  |  |  |
Share settlement (in shares) |  |  |  |  | 15,600,000 |  | 15,600,000 |  |  |
Issuance of common stock, net |  |  |  |  | $ 534,000 |  |  |  |  |
Issuance of common stock, net (in shares) |  |  |  |  |  |  |  | 0 |  | 0
2019 Forward Equity Offering | Maximum |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average net price (in usd per share) |  |  |  |  | $ 34.18 |  | $ 34.18 |  |  |
Forward Equity Offering |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Option indexed to issuers equity, term |  |  | 1 year |  |  |  |  |  |  |
Maximum shares issuable under forward equity sales agreement (in shares) |  |  | 15,300,000 |  |  |  |  |  |  |
Forward equity sales agreement, initial net price (in usd per share) |  |  | $ 28.60 |  |  |  |  |  |  |
Share settlement (in shares) |  |  |  |  |  |  |  |  |  | 15,300,000
Issuance of common stock, net |  |  |  |  |  | $ 100,000 |  |  | $ 142,000 | $ 422,000
Issuance of common stock, net (in shares) |  |  |  |  |  | 3,600,000 |  |  | 5,100,000 | 0
Weighted average net price (in usd per share) |  |  |  |  |  | $ 27.85 |  |  | $ 27.85 |
Forward Equity Offering | Maximum |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average net price (in usd per share) |  |  |  |  |  | $ 27.93 |  |  | $ 27.93 | $ 27.66

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