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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

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