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Consolidated Balance Sheets (Parenthetical) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Deferred financing costs $ 6,763,000 $ 7,353,000
Common stock, par value (in dollars per share) $ 0.01 $ 0.01
Common stock, shares authorized (in shares) 450,000,000 450,000,000
Common stock, shares issued (in shares) 91,422,676 67,195,252
Common shares outstanding (in shares) 91,422,676 67,195,252
Series A Preferred Stock [Member]    
Preferred stock, shares issued (in shares) 3,450,000 3,450,000
Preferred stock, shares outstanding (in shares) 3,450,000 3,450,000
Preferred stock, aggregate liquidation preference $ 86,250,000 $ 86,250,000
Series B Preferred Stock [Member]    
Preferred stock, shares issued (in shares) 8,000,000 8,000,000
Preferred stock, shares outstanding (in shares) 8,000,000 8,000,000
Preferred stock, aggregate liquidation preference $ 200,000,000 $ 200,000,000
Series C Preferred Stock [Member]    
Preferred stock, shares issued (in shares) 6,900,000  
Preferred stock, shares outstanding (in shares) 6,900,000  
Preferred stock, aggregate liquidation preference $ 172,000