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Long-Term Debt (Long-term Debt Table) (Details)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]    
Accumulated Amortization, Debt Issuance Costs $ 4,214,000 $ 4,138,000
Revolving credit facility, maximum borrowing capacity 300,000,000  
Debt issuance costs (1,195,000) (1,270,000)
Current maturities on long-term debt (14,027,000) (13,021,000)
Long-term debt, excluding current maturities 197,752,000 204,404,000
Revolving credit facility present accordion provisions 75,000,000  
Credit Agreement [Member] | Revolving Credit Facility [Member]    
Debt Instrument [Line Items]    
Carrying value of the liability component   67,700,000
Credit Agreement [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Carrying value of the liability component 135,937,000 138,750,000
Current maturities on long-term debt (12,188,000) (11,250,000)
Notes Payable, Other Payables [Member] | Acquisition Debt, Deferred Purchase Price [Member]    
Debt Instrument [Line Items]    
Carrying value of the liability component 11,937,000 12,245,000
Current maturities on long-term debt $ (1,840,000) $ (1,771,000)
Term Number Two [Member]    
Debt Instrument [Line Items]    
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015) 3.5