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Subsequent Events - Perpetual Preferred Shares Offering (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 6 Months Ended
Jul. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Subsequent Event [Line Items]      
Stock issuance costs   $ 350 $ 0
Subsequent Event | Series G, Preferred Perpetual Shares | Underwritten Public Offering      
Subsequent Event [Line Items]      
Shares issued during period (in shares) 4,600,000    
Preferred stock, dividend rate, percentage 5.875%    
Proceeds from issuance of preferred stock $ 115,000    
Stock issuance costs $ 4,100    
Liquidation preference per share (in dollars per share) $ 25.00