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Preferred stock (Details) - USD ($)
9 Months Ended
Sep. 27, 2017
Sep. 22, 2017
Oct. 14, 2016
Oct. 11, 2016
Sep. 30, 2017
Dec. 31, 2016
Shares issued         2,500,000 1,000,000
Par value         $ 0.01 $ 0.01
Redeemable Preferred Stock            
Redemption price         20  
Series A Preferred Stock            
Shares issued       1,000,000    
Dividend rate (as a percent)       6.50%    
Par value       $ 0.01    
Purchase price       $ 20.00    
Liquidation preference     $ 20.00      
Net proceeds after deducting investor fees     $ 19,800,000      
Dividend     $ 6.5   0  
Series A-2 Preferred Stock            
Shares issued   1,500,000        
Dividend rate (as a percent)   6.50%        
Par value   $ 0.01        
Purchase price   $ 20.00        
Liquidation preference         $ 20.00  
Preferred stock dividends paid $ 587,671.23          
Net proceeds after deducting investor fees         $ 29,700,000