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Subsequent Events (Details) - USD ($)
$ in Thousands
6 Months Ended
Jul. 22, 2019
Jul. 17, 2019
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Subsequent Event [Line Items]          
Payment of dividend     $ 93,858 $ 85,931  
Proceeds from issuance of stock     0 $ 124,147  
Outstanding borrowings     $ 375,000   $ 45,000
Subsequent event [Member]          
Subsequent Event [Line Items]          
Payment of dividend   $ 50,800      
Proceeds from issuance of stock $ 354,300        
Subsequent event [Member] | Revolving credit facility [Member]          
Subsequent Event [Line Items]          
Outstanding borrowings $ 60,000        
Subsequent event [Member] | Common Stock [Member]          
Subsequent Event [Line Items]          
Number of shares issued (in shares) 5,000,000