Annual report pursuant to Section 13 and 15(d)

Fair Value Measurements (Details)

v3.6.0.2
Fair Value Measurements (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Jul. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Income tax expense benefit on interest rate swap $ 28 $ 48  
Earn-out obligations - current 0 9,678  
Aviation      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Increase in earn-out obligations (1,300)    
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Accrued expenses      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swaps 0 123  
Fair Value, Measurements, Recurring | Fair Value, Inputs, Level 2 | Other current assets      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Interest rate swaps 73 0  
Fair Value, Measurements, Recurring | Fair Value, Inputs, 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