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Derivative Financial Instruments (Details) - USD ($)
3 Months Ended
Jan. 18, 2018
Jan. 04, 2016
Jan. 23, 2014
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Derivatives, Fair Value [Line Items]            
Hedge ineffectiveness gain (loss)       $ 0 $ 0  
Fair value of derivative instrument [Abstract]            
Fair value of interest rate swaps       (108,000)   $ (221,000)
Interest Rate Swap Contracts            
Derivatives, Fair Value [Line Items]            
Percentage of Term Loan balance covered under interest rate swap contract     75.00%      
Termination of contract date   Jan. 01, 2019 Sep. 30, 2023      
Interest earned upon termination of swap agreement $ 27,000          
Notional amount   $ 9,100,000   6,900,000    
Fixed interest rate (in hundredths)     2.86%      
Unrealized net losses recorded in Accumulated other comprehensive loss       $ 100,000    
Interest Rate Swap Contracts | One Month LIBOR            
Derivatives, Fair Value [Line Items]            
One month variable interest rate (in hundredths)       1.80%    
Interest Rate Swap Contracts | Derivatives in Cash Flow Hedging Relationships | Interest Expense            
Effect of interest rate swap contract accounted for derivative instrument on Consolidated Statements of Income [Abstract]            
Amount of Gain Recognized in Accumulated OCI (Effective Portion)       $ 112,000 83,000  
Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion)       $ 22,000 $ 53,000