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Derivative Financial Instruments (Details) - USD ($)
12 Months Ended
Jan. 23, 2014
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jan. 04, 2016
Derivatives, Fair Value [Line Items]          
Fair value of derivative financial instruments   $ 221,000 $ 424,000    
Hedge ineffectiveness gain (loss)   0 0 $ 0  
Fair value of derivative instrument [Abstract]          
Fair value of interest rate swap   (221,000) (424,000)    
Interest Rate Swap Contracts          
Derivatives, Fair Value [Line Items]          
Unrealized net losses recorded in Accumulated other comprehensive loss   221,000      
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 (Loss) Recognized in Accumulated OCI (Effective Portion)   203,000 145,000 (66,000)  
Amount of Loss Reclassified from Accumulated OCI into Income (Effective Portion)   $ 150,000 $ 292,000 $ 209,000  
Interest Rate Swap, Effective January 23, 2014 [Member]          
Derivatives, Fair Value [Line Items]          
Percentage of Term Loan balance covered under interest rate swap contract 75.00%        
Termination of contract date   Sep. 30, 2023      
Notional amount   $ 6,900,000      
Fixed interest rate (in hundredths)   2.86%      
Interest Rate Swap, Effective January 23, 2014 [Member] | One Month LIBOR          
Derivatives, Fair Value [Line Items]          
One month variable interest rate (in hundredths)   1.49%      
Interest Rate Swap Effective January 4, 2016 [Member]          
Derivatives, Fair Value [Line Items]          
Notional amount         $ 9,100,000
Fixed interest rate (in hundredths)   1.28%      
Interest Rate Swap Effective January 4, 2016 [Member] | One Month LIBOR          
Derivatives, Fair Value [Line Items]          
One month variable interest rate (in hundredths)   1.49%