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Common Stock (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Dec. 30, 2019
Apr. 30, 2020
Sep. 30, 2018
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2020
Jun. 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                   $ 541,715,000 $ 244,512,000        
Preferred stock, par value (in dollars per share)       $ 0.0001   $ 0.0001       $ 0.0001   $ 0.0001      
Preferred stock, shares authorized       4,000,000   4,000,000       4,000,000   4,000,000      
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   6,851,695 1,400,251     3,512,500 874,268            
Proceeds From Issuance Of Common Stock   $ 170,400,000                          
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                 3,162,500      
Proceeds From Issuance Of Common Stock $ 195,800,000   $ 186,000,000.0                        
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                   $ 59,300,000          
Value Of Equity Instruments To Be Issued       $ 0           0         $ 250,000,000.0
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             $ 33,000,000.0     254,300,000          
Value Of Equity Instruments To Be Issued                         $ 400,000,000.0    
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         $ 400,000,000.0                    
At-Market Equity Program Four [Member] | Common Stock [Member]                              
Class of Stock [Line Items]                              
Forward Contract Indexed to Issuer's Equity, Shares       742,860 204,074                    
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Shares, at Fair Value       742,860           742,860          
Forward Contract Indexed to Issuer's Equity, Settlement Alternatives, Cash, at Fair Value       $ 337,800,000           $ 337,800,000          
Stock Issued During Period, Shares, New Issues       0                      
Proceeds From Issuance Of Common Stock                   $ 12,700,000          
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