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Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2019 | Apr. 30, 2020 | Sep. 30, 2018 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Jul. 31, 2019 | Apr. 30, 2019 | May 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  | 90,000,000 |  |  | 90,000,000 |  |  |  | 90,000,000 |  | 90,000,000 |  |  |
Proceeds From Issuance Of Common Stock |  |  |  |  |  |  |  |  |  |  | $ 629,586 | $ 276,960 |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  | 2,875,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  | 2,875,000 |  | 1,515,000 | 6,851,695 | 1,400,251 |  | 444,251 | 3,512,500 | 874,268 |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  | $ 170,400 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  | 6,166,666 | 3,500,000 |  |  |  |  |  |  |  |  |  |  |  | 3,162,500 |
Stock Issued During Period, Shares, New Issues |  |  | 3,500,000 | 1,515,000 |  |  |  |  |  |  |  |  | 3,162,500 |  |  |
Proceeds From Issuance Of Common Stock | $ 195,800 |  | $ 186,000 | $ 88,000 |  |  |  |  |  |  |  |  |  |  |  |
At-Market Equity Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  |  |  |  |  | 3,169,754 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  |  |  |  |  | 886,768 |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  |  |  |  |  |  |  |  |  | $ 58,500 |  |  |  |
Value Of Equity Instruments To Be Issued |  |  |  | 0 |  |  |  |  |  |  | 0 |  |  |  |  | $ 250,000
At-Market Equity Program Two [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  |  |  |  |  |  | 2,003,118 |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  | 444,228 |  |  |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  |  |  |  |  | $ 32,600 |  |  | 359,500 |  |  |  |  |
Value Of Equity Instruments To Be Issued |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 400,000 |  |
Common stock Average Price |  |  |  |  |  |  |  | $ 74.30 |  |  |  |  |  |  |  |
At-Market Equity Program Three [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value Of Equity Instruments To Be Issued |  |  |  | $ 0 |  |  |  |  |  |  | $ 0 |  |  |  |  |
At-Market Equity Program Four [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value Of Equity Instruments To Be Issued |  |  |  |  |  | $ 400,000 |  |  |  |  |  |  |  |  |  |
At-Market Equity Program Four [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  |  |  |  |  |  |  |  |  |  | 1,832,846 |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value |  |  |  | 1,628,772 |  |  |  |  |  |  | 1,628,772 |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value |  |  |  | $ 278,000 |  |  |  |  |  |  | $ 278,000 |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  |  |  |  |  | 204,074 |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  |  |  |  |  |  |  |  | $ 12,500 |  |  |  |  |
Over-Allotment Option [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  | 375,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Over-Allotment Option [Member] | Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 412,500 |

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