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Stockholders' Equity of the Company - Narrative (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 25, 2020 | Feb. 18, 2020 | Mar. 31, 2020 | Jul. 31, 2019 | Aug. 31, 2018 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | May 19, 2020 | May 18, 2020 | Jun. 30, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, authorized (shares) |  |  |  |  |  | 280,000,000 | 150,000,000 |  | 280,000,000 | 150,000,000 |
Common stock, value, issued |  |  |  |  |  | $ 1,160,000 | $ 1,060,000 |  |  |  |
Aggregate net proceeds after selling commissions |  |  |  |  |  | $ 721,665,000 | $ 353,722,000 | $ 130,693,000 |  |  |
Sale of stock, shares issued (in shares) |  |  |  |  |  | 116,035,827 | 106,016,287 |  |  |  |
Stock repurchase program, number of shares authorized to be repurchased |  |  |  |  |  | 4,935,826 |  |  |  |  |
Stock repurchased during period (in shares) |  |  |  |  |  | 0 | 0 | 0 |  |  |
2014 At-The-Market Program [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate gross proceeds |  |  |  |  |  |  |  | $ 300,000,000.0 |  |  |
2018 At-The-Market Program [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate gross proceeds |  |  |  |  |  |  |  |  |  |  | $ 500,000,000.0
Issuance of Equity under ATM Program [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate net proceeds after selling commissions |  |  |  |  |  | $ 247,300,000 |  | 132,100,000 |  |  |
Aggregate gross proceeds |  |  |  |  |  | $ 252,000,000.0 |  | $ 133,800,000 |  |  |
Shares issued, price per share (in dollars per share) |  |  |  |  |  | $ 80.08 |  | $ 73.64 |  |  |
Forward Equity Offering [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Common stock, value, issued |  | $ 494,500,000 |  |  | $ 360,500,000 |  |  |  |  |  |
Stock issued, price per share (in dollar per share) |  | $ 86.00 |  |  | $ 72.10 |  |  |  |  |  |
Aggregate net proceeds after selling commissions |  |  |  | $ 354,300,000 |  |  |  |  |  |  |
Forward Equity Offering [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued (in shares) |  | 5,750,000 |  | 5,000,000 | 5,000,000 |  |  |  |  |  |
Aggregate net proceeds after selling commissions | $ 474,900,000 |  |  | $ 354,300,000 |  |  |  |  |  |  |
Sale of stock, shares issued (in shares) | 5,750,000 |  | 5,750,000 | 5,000,000 |  |  |  |  |  |  |
Forward Equity Offering [Member] | Common Stock [Member] | 2014 At-The-Market Program [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Sale of stock, shares available for sale (in shares) |  |  |  |  |  |  |  | 1,369,729 |  |  |
Forward Equity Offering [Member] | Common Stock [Member] | 2018 At-The-Market Program [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Stock issued, price per share (in dollar per share) |  |  |  |  |  |  | $ 80.08 |  |  |  |
Sale of stock, shares available for sale (in shares) |  |  |  |  |  |  | 3,147,110 | 447,466 |  |  |
Sale of stock, shares issued (in shares) |  |  |  |  |  | 3,594,576 |  |  |  |  |
Sale of stock, available for sale under program |  |  |  |  |  | $ 214,200,000 |  |  |  |  |
Forward Equity Offering [Member] | Common Stock [Member] | Issuance of Equity under ATM Program [Member] |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |
Aggregate net proceeds after selling commissions |  |  | $ 247,300,000 |  |  | $ 247,300,000 |  |  |  |  |
Sale of stock, shares issued (in shares) |  |  | 3,147,110 |  |  |  |  |  |  |  |

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