Goodwill and Other Intangibles Pro Forma Omni Acquisition (Details) - Omni Air [Member] - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2018
Restructuring Cost and Reserve [Line Items]
Business Acquisition, Pro Forma Revenue		$ 327,801	$ 633,657
Business Acquisition, Pro Forma Net Income (Loss)		$ 32,715	54,129
Depreciation	$ 2,600		$ 5,300

The pro forma net Income or Loss for the period as if the business combination or combinations had been completed at the beginning of a period.

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