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Segment Information (Narrative) (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2018
USD ($)
segments
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
Segment Reporting Information [Line Items]                        
REVENUES $ 280,779 $ 204,919 $ 203,607 $ 203,040 $ 322,971 $ 254,101 $ 253,211 $ 237,917 $ 892,345 $ 1,068,200 $ 768,870  
Deferred Revenue, Revenue Recognized                 9,300      
Deferred Revenue $ 3,100       $ 9,500       $ 3,100 9,500    
Number of reportable segments (in segments) | segments                 3      
Interest expense                 $ 28,799 17,023 11,318  
Customer Revenues [Member]                        
Segment Reporting Information [Line Items]                        
REVENUES                 892,345 $ 1,068,200 $ 768,870  
Schedule of Revenue from External Customers and Long-Lived Assets, by Geographical Areas [Table Text Block]                   231799 170100 168221
ACMI Services [Member]                        
Segment Reporting Information [Line Items]                        
REVENUES                 548,839 $ 614,741 $ 492,859  
Property, Plant and Equipment, Additions                 38,900      
ACMI Services [Member] | Customer Revenues [Member]                        
Segment Reporting Information [Line Items]                        
REVENUES                   614,721 492,859  
CAM [Member]                        
Segment Reporting Information [Line Items]                        
REVENUES                 228,956 209,560 195,092  
Interest expense                 21,800 15,600 10,600  
Property, Plant and Equipment, Additions                 249,400      
CAM [Member] | Customer Revenues [Member]                        
Segment Reporting Information [Line Items]                        
REVENUES                   140,434 117,642  
Ground Services [Member] | Customer Revenues [Member]                        
Segment Reporting Information [Line Items]                        
REVENUES                 66,570 204,149 114,813  
MRO Services [Member] [Member]                        
Segment Reporting Information [Line Items]                        
REVENUES                 207,539 205,401 111,913  
Property, Plant and Equipment, Additions                 2,200      
MRO Services [Member] [Member] | Customer Revenues [Member]                        
Segment Reporting Information [Line Items]                        
REVENUES                   $ 106,767 $ 40,754  
Difference between Revenue Guidance in Effect before and after Topic 606 [Member]                        
Segment Reporting Information [Line Items]                        
REVENUES                 (357,295)      
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | ACMI Services [Member] | Customer Revenues [Member]                        
Segment Reporting Information [Line Items]                        
REVENUES                 (194,308)      
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | CAM [Member] | Customer Revenues [Member]                        
Segment Reporting Information [Line Items]                        
REVENUES                 0      
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | Ground Services [Member] | Customer Revenues [Member]                        
Segment Reporting Information [Line Items]                        
REVENUES                 180,029      
Difference between Revenue Guidance in Effect before and after Topic 606 [Member] | MRO Services [Member] [Member] | Customer Revenues [Member]                        
Segment Reporting Information [Line Items]                        
REVENUES                 $ 17,042