Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

v3.5.0.2
Fair Value Measurements (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Jul. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Earn-out obligations - current $ 0 $ 9,678  
Earn-out obligation - long-term 0 10,166  
Income tax expense benefit on interest rate swap 194 48  
Aviation Acquisitions      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Increase decrease in earn-out obligations 1,300    
Fair Value, Measurements, Recurring | Level 1 | Other assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Non-COLI assets held in Deferred Supplemental Compensation Plan 292 264  
Fair Value, Measurements, Recurring | Level 2 | Accrued expenses      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swaps 503 123  
Fair Value, Measurements, Recurring | Level 3 | Current portion of earn-out obligation      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Earn-out obligations - current 0 9,678 $ 10,500
Fair Value, Measurements, Recurring | Level 3 | Earn-out obligation      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Earn-out obligation - long-term $ 0 $ 10,166