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Shareholders' Equity - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended
Mar. 15, 2018
Feb. 05, 2018
Feb. 28, 2018
Mar. 31, 2018
Dec. 31, 2017
Oct. 06, 2017
Subsidiary or Equity Method Investee [Line Items]            
Total number of common and preferred shares authorized (in shares)           750,000,000
Common stock, shares authorized (in shares)       700,000,000 700,000,000 700,000,000
Common stock, par value (in dollars per share)       $ 0.01 $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares)       50,000,000 50,000,000 50,000,000
Preferred stock, par value (in dollars per share)       $ 0.01 $ 0.01 $ 0.01
Preferred stock, shares issued (in shares)       12,000,000 12,000,000  
Shares issued in IPO (in shares)   69,575,000        
Share price (in dollars per share)   $ 20.00        
Aggregate offering value of shares   $ 1,391,500   $ 1,307,119    
Proceeds from issuance of common stock   $ 1,307,100 $ 1,307,100      
Common stock, shares issued (in shares)       370,128,832 300,278,938  
Cash dividend per share (in dollars per share) $ 0.16          
Distribution rate per share (in dollars per share) $ 0.2625          
Series A Preferred Stock            
Subsidiary or Equity Method Investee [Line Items]            
Preferred stock, par value (in dollars per share)           $ 0.01
Preferred stock, shares issued (in shares)           12,000,000