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Derivative Instruments (Interest Rate Swaps) (Details) - Interest Rate Swaps, Maturity Date, March 15, 2021, 2.415% [Member] - Interest Rate Swap [Member] - SunTrust [Member] - Not Designated as Hedging Instrument [Member] - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Derivative [Line Items]    
Notional amount $ 85,500  
Pay rate 2.415%  
Derivative liabilities $ (2,113) $ (3,139)