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Derivatives - Rate Cap Transaction narrative (Details) - Not Designated as Hedging Instrument [Member] - Interest rate cap [Member]
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
USD ($)
Sep. 30, 2016
USD ($)
derivative_instrument
Sep. 30, 2015
USD ($)
Dec. 31, 2015
USD ($)
Derivative [Line Items]        
Number of derivative instruments | derivative_instrument   1    
Notional amount   $ 10,000,000   $ 10,000,000
Premium paid   70,000   70,000
Fair value   $ 3,000   $ 39,000
3-Month LIBOR [Member]        
Derivative [Line Items]        
Strike rate   2.00%   2.00%
Operating Expenses [Member]        
Derivative [Line Items]        
Change in fair value of derivative $ 35,000 $ 36,000 $ 35,000 $ 31,000