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Subsequent Events - Dividends (Details) - $ / shares
1 Months Ended 3 Months Ended 6 Months Ended
Jul. 03, 2018
Aug. 01, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Subsequent Event [Line Items]            
Cash dividend declared by board (in usd per share)     $ 0.45 $ 0.19 $ 0.9 $ 0.37
Subsequent Event            
Subsequent Event [Line Items]            
Cash dividend paid per common share (in usd per share) $ 0.45          
Dividend payable record date May 15, 2018 Sep. 07, 2018        
Cash dividend declared by board (in usd per share)   $ 0.45        
Dividend to be paid date   Oct. 01, 2018        
Subsequent Event | Partnerships Exchangeable Units            
Subsequent Event [Line Items]            
Partnership exchangeable unit (in usd per unit) $ 0.45 $ 0.45