Goodwill and Other Intangibles (Schedule of Goodwill) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill, Acquired During Period	$ 5,229
Goodwill [Roll Forward]
Carrying value, beginning balance	395,974	$ 390,745	$ 37,279
Purchase Price Adjustment to Goodwill		353,466
Carrying value, ending balance	395,974	390,745
ACMI Services [Member]
Goodwill [Line Items]
Goodwill, Acquired During Period	0	234,571
Goodwill [Roll Forward]
Carrying value, beginning balance	234,571	234,571	0
Carrying value, ending balance	234,571	234,571
CAM [Member]
Goodwill [Line Items]
Goodwill, Acquired During Period	0	118,895
Goodwill [Roll Forward]
Carrying value, beginning balance	153,290	153,290	34,395
Carrying value, ending balance	153,290	153,290
MRO Services [Member] [Member]
Goodwill [Line Items]
Goodwill, Acquired During Period	5,229
Goodwill [Roll Forward]
Carrying value, beginning balance	8,113	2,884	$ 2,884
Purchase Price Adjustment to Goodwill		0
Carrying value, ending balance	$ 8,113	$ 2,884