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Long-Term Debt (Long-term Debt Table) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]          
Accumulated Amortization, Debt Issuance Costs $ 4,290,000   $ 4,290,000   $ 4,138,000
Revolving credit facility, maximum borrowing capacity 300,000,000   300,000,000    
Debt issuance costs (1,118,000)   (1,118,000)   (1,270,000)
Current maturities on long-term debt (15,040,000)   (15,040,000)   (13,021,000)
Long-term debt, excluding current maturities 190,708,000   190,708,000   204,404,000
Revolving credit facility present accordion provisions 75,000,000   75,000,000    
Amortization of Debt Issuance Costs     408,000 $ 420,000  
Credit Agreement [Member]          
Debt Instrument [Line Items]          
Amortization of Debt Issuance Costs 100,000 $ 100,000 200,000 $ 200,000  
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 133,125,000   133,125,000   138,750,000
Current maturities on long-term debt (13,125,000)   (13,125,000)   (11,250,000)
Notes Payable, Other Payables [Member] | Acquisition Debt, Deferred Purchase Price [Member]          
Debt Instrument [Line Items]          
Carrying value of the liability component 11,641,000   11,641,000   12,245,000
Current maturities on long-term debt $ (1,915,000)   $ (1,915,000)   $ (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   3.5