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Issuances of Common Stock - Issuances of Common Stock (Details) - USD ($)
$ in Thousands
1 Months Ended 6 Months Ended
May 31, 2019
Jun. 30, 2019
Jun. 30, 2018
Class of Stock [Line Items]      
Proceeds from share issuances, net   $ 845,061 $ 0
Common stock | Overnight Underwritten Public Offering      
Class of Stock [Line Items]      
Share issuances (in shares) 12,650,000    
Underwriting discounts and other offering costs $ 31,000    
Proceeds from share issuances, net $ 845,100