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Long-Term Debt Long-Term Debt (Senior long-term debt) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Debt Instrument [Line Items]    
Principal amount $ 208,466  
Less: current portion (12,012) $ (9,630)
Total long-term debt 196,454 152,387
Notes payable, other | Acquisition Debt    
Debt Instrument [Line Items]    
Principal amount 4,929 1,205
Revolving Credit Facility | Line of Credit | Revolving Credit Facility, Secured, Floating Rate    
Debt Instrument [Line Items]    
Principal amount 92,600 40,500
Credit Facility, Term Note | Notes payable, other    
Debt Instrument [Line Items]    
Principal amount $ 110,900 $ 120,312