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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2017
Dec. 31, 2016
Preferred stock, par value (in dollars per share) $ 0.01 $ 0.01
Preferred stock, shares authorized (in shares) 100,000,000 100,000,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 500,000,000 500,000,000
Common stock, shares issued (in shares) 61,702,628 51,401,295
Common stock, shares outstanding (in shares) 61,702,628 51,401,295
Special voting preferred shares    
Preferred stock, shares issued (in shares) 21,230,769 21,230,769
Preferred stock, shares outstanding (in shares) 21,230,769 21,230,769
8.25% Series A preferred stock    
Preferred stock, dividend rate (as a percent) 8.25% 8.25%
Preferred stock, aggregate liquidation preference $ 38,787,500 $ 38,787,500
Preferred stock, shares issued (in shares) 1,551,500 1,551,500
Preferred stock, shares outstanding (in shares) 1,551,500 1,551,500
7.75% Series B preferred stock    
Preferred stock, dividend rate (as a percent) 7.75% 7.75%
Preferred stock, aggregate liquidation preference $ 31,500,000 $ 31,500,000
Preferred stock, shares issued (in shares) 1,260,000 1,260,000
Preferred stock, shares outstanding (in shares) 1,260,000 1,260,000
8.50% Series C preferred stock    
Preferred stock, dividend rate (as a percent) 8.50% 8.50%
Preferred stock, aggregate liquidation preference $ 22,500,000 $ 22,500,000
Preferred stock, shares issued (in shares) 900,000 900,000
Preferred stock, shares outstanding (in shares) 900,000 900,000