Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

v3.4.0.3
Fair Value Measurements (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earn-out obligations - current $ 8,015 $ 9,678
Earn-out obligation - long-term 10,445 10,166
Income tax expense benefit on interest rate swap 344 48
Aviation Acquisitions [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earn-out obligations - current 8,000  
Earn-out obligation - long-term 10,400  
Decrease in earn-out obligations (1,400)  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Other Assets [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Non-COLI assets held in Deferred Supplemental Compensation Plan 273 264
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Accrued Expenses [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Interest rate swaps 892 123
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Current Portion of Earn-out Obligation [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earn-out obligations - current 8,015 9,678
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Earn-out Obligation[Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Earn-out obligation - long-term $ 10,445 $ 10,166