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Equity and Noncontrolling Interests - Summary of Capital Structure (Details) - USD ($)
$ / shares in Units, $ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Class Of Stock [Line Items]    
Shares authorized 50,000,000 50,000,000
Shares issued 20,912,396 18,154,365
Treasury shares 91,951 76,118
Shares outstanding 20,820,445 18,078,247
Par value per share $ 0.01 $ 0.01
Series A Preferred Dividends    
Class Of Stock [Line Items]    
Shares authorized 50,000 50,000
Shares issued 45,500 45,500
Shares outstanding 45,500 45,500
Par value per share $ 0.01 $ 0.01
Liquidation preference per share $ 100 $ 100
Liquidation preference amount $ 4,550 $ 4,550
Series B Preferred Dividends    
Class Of Stock [Line Items]    
Shares authorized 115,000 115,000
Shares issued 51,076 51,956
Shares outstanding 51,076 51,956
Par value per share $ 0.01 $ 0.01
Liquidation preference per share $ 100 $ 100
Liquidation preference amount $ 5,108 $ 5,196