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Long-Term Debt Long-Term Debt (Senior long-term debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]    
Principal amount $ 218,695  
Debt Issuance Costs, Net (1,270) $ (1,445)
Less: current portion (13,021) (12,012)
Total long-term debt, net of current portion 204,404 195,009
Notes payable, other | Acquisition Debt    
Debt Instrument [Line Items]    
Principal amount 12,245 4,929
Revolving Credit Facility | Line of Credit | Revolving Credit Facility, Secured, Floating Rate    
Debt Instrument [Line Items]    
Principal amount 67,700 92,600
Credit Facility, Term Note | Notes payable, other    
Debt Instrument [Line Items]    
Principal amount $ 138,800 $ 110,937