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Long-Term Debt (Long-term Debt Table) (Details)
Jun. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]    
Revolving credit facility, maximum borrowing capacity $ 300,000,000  
Debt issuance costs 1,422,000 $ 1,445,000
Current maturities on long-term debt (12,372,000) (12,012,000)
Long-term debt, excluding current maturities 198,396,000 195,009,000
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   92,600,000
Credit Agreement [Member] | Term Loan [Member]    
Debt Instrument [Line Items]    
Carrying value of the liability component 144,375,000 110,937,000
Notes Payable, Other Payables [Member] | Acquisition Debt, Deferred Purchase Price [Member]    
Debt Instrument [Line Items]    
Carrying value of the liability component $ 7,815,000 $ 4,929,000
Term Number Two [Member]    
Debt Instrument [Line Items]    
Ratio of indebtedness to net capital (in Ratio) (below at March 31, 2015) 3.5