Quarterly report pursuant to Section 13 or 15(d)

Fair Value Measurements (Details)

v3.5.0.2
Fair Value Measurements (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Earn-out obligations - current $ 10,500 $ 10,500 $ 9,678
Earn-out obligation - long-term 0 0 10,166
Income tax expense benefit on interest rate swap   405 48
Aviation Acquisitions [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Increase decrease in earn-out obligations 55 (1,300)  
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 281 281 264
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 1,053 1,053 123
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 10,500 10,500 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 $ 0 $ 0 $ 10,166