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Long-term Debt (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Dec. 31, 2016
Mar. 31, 2016
Jun. 02, 2015
Debt Instrument [Line Items]        
Advances on line of credit $ 15,000      
Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Credit facility effective interest rate 1.50%      
Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Credit facility effective interest rate 2.00%      
Revolving Credit Facility [Member]        
Debt Instrument [Line Items]        
Credit facility, maximum borrowing capacity $ 75,000      
Credit facility, available borrowing capacity $ 65,000      
Term Loan [Member]        
Debt Instrument [Line Items]        
Credit facility effective interest rate 2.48% 2.27%    
Letter of Credit [Member]        
Debt Instrument [Line Items]        
Line of credit outstanding $ 1,100   $ 900  
Credit Agreement [Member]        
Debt Instrument [Line Items]        
Credit facility, maximum borrowing capacity $ 125,000      
Debt issuance costs       $ 1,000
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Credit facility effective interest rate 2.48%      
Credit Agreement [Member] | Federal Funds Rate [Member]        
Debt Instrument [Line Items]        
Credit facility, spread on variable interest rate 0.50%      
Credit Agreement [Member] | Eurodollar [Member]        
Debt Instrument [Line Items]        
Credit facility, spread on variable interest rate 1.00%      
Credit Agreement [Member] | Base Rate [Member]        
Debt Instrument [Line Items]        
Credit facility effective interest rate 4.50%      
Credit Agreement [Member] | Minimum [Member]        
Debt Instrument [Line Items]        
Credit facility, interest rate based on leverage ratio 0.50%      
Credit Agreement [Member] | Maximum [Member]        
Debt Instrument [Line Items]        
Credit facility, interest rate based on leverage ratio 1.00%      
Credit Agreement [Member] | Term Loan [Member]        
Debt Instrument [Line Items]        
Credit facility, maximum borrowing capacity $ 50,000      
Credit facility term 5 years      
Loan payable $ 16,500