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Subsequent Events - Share Issuances (Details) - USD ($)
$ / shares in Units, shares in Millions
 1 Months Ended 6 Months Ended
Jul. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Nov. 30, 2016
Subsequent Event [Line Items]        
Proceeds from issuance of shares   $ 355,589,000 $ 2,000  
Stock issuance costs   $ 350,000 $ 0  
At the Market - Common Share Offering Program | Class A common shares        
Subsequent Event [Line Items]        
Shares issued during period (in shares)   0.9    
Proceeds from issuance of shares   $ 19,400,000    
Shares issued, price per share (in dollars per share)   $ 22.75    
Proceeds from issuance of common stock, net of issuance costs   $ 19,100,000    
Stock issuance costs   300,000    
Shares available for future issuance, value   $ 276,600,000   $ 400,000,000
Subsequent Event | At the Market - Common Share Offering Program        
Subsequent Event [Line Items]        
Proceeds from issuance of shares $ 26,900,000      
Shares issued, price per share (in dollars per share) $ 22.73      
Proceeds from issuance of common stock, net of issuance costs $ 26,500,000      
Stock issuance costs 400,000      
Shares available for future issuance, value $ 249,800,000      
Subsequent Event | At the Market - Common Share Offering Program | Class A common shares        
Subsequent Event [Line Items]        
Shares issued during period (in shares) 1.2