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Common and Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 30, 2019 | Apr. 30, 2019 | Sep. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017 | Jul. 31, 2019 | Mar. 31, 2019 | May 31, 2018 | Mar. 31, 2018
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  | 90,000,000 |  |  | 90,000,000 |  |  | 90,000,000 | 90,000,000 |  |  | 45,000,000 |  |
Proceeds From Issuance Of Common Stock |  |  |  |  |  |  |  | $ 472,746 | $ 339,744 | $ 222,695 |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  |  | $ 0.0001 |  |  | $ 0.0001 | $ 0.0001 |  |  |  |  |
Preferred stock, shares authorized |  |  |  |  | 4,000,000 |  |  | 4,000,000 | 4,000,000 |  |  |  |  |
Series A Junior Participating Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Preferred Stock, Redesignated of Shares Authorized |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 2,415,000 |  |  |  | 7,993,519 | 6,507,263 | 4,786,604 |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  | $ 108,000 |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | Forward Contracts Two [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  | 3,500,000 |  |  |  |  |  |  |  |  |  |  |
Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  | 3,162,500 |  |  |  |  |  |  |  |  |  |  |  | 3,450,000
Stock Issued During Period, Shares, New Issues |  | 3,450,000 |  |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Common Stock | $ 195,800 | $ 186,000 |  |  |  |  |  |  |  |  |  |  |  |
ATM Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Forward Contract Indexed to Issuer's Equity, Shares |  |  |  |  | 2,003,118 |  |  |  |  |  |  |  |  |
At-Market Equity Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  |  | 886,768 |  | 3,057,263 |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  |  |  |  | $ 59,300 |  | $ 181,200 |  |  |  |  |
Value Of Equity Instruments To Be Issued |  |  |  |  | $ 0 |  |  | $ 0 |  |  |  |  | $ 250,000 |
Common stock Average Price |  |  |  |  |  |  | $ 66.83 |  | $ 59.28 |  |  |  |  |
At-Market Equity Program Two [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  |  |  | 444,228 |  |  |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  |  |  |  | $ 33,000 |  |  |  |  |  |  |  |
Gross Amount Remaining To Be Issued |  |  |  |  | $ 220,100 |  |  | $ 220,100 |  |  |  |  |  |
Common stock Average Price |  |  |  |  |  | $ 74.30 |  |  |  |  |  |  |  |
At-Market Equity Program Two [Member] | ATM Program [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Value Of Equity Instruments To Be Issued |  |  |  |  |  |  |  |  |  |  | $ 400,000 |  |  |
Over-Allotment Option [Member] | Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common Stock, Shares Authorized |  |  |  |  |  |  |  |  |  |  |  |  |  | 450,000
Common Stock [Member] | Forward Sale Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 3,450,000 |  |  |  |  |  |  |  |  |  |  |
Proceeds From Issuance Of Common Stock |  |  | $ 160,200 |  |  |  |  |  |  |  |  |  |  |

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