Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Fair Value Adjustment of Warrants	$ (55,900)	$ 93,400	$ (48,300)	$ 72,700
REVENUES	404,146	366,073	1,171,217	1,048,832
Net earnings from continuing operations	(5,745)	105,085	22,826	101,087
EARNINGS FROM DISCONTINUED OPERATIONS, NET OF TAXES	$ 154	$ 243	$ 4,162	$ 305
Weighted average shares:
Basic (in shares)	59,146	58,919	59,106	58,889
Diluted (in shares)	59,146	68,718	59,863	69,382
Earnings (loss) per share from continuing operations
Basic (in dollars per share)	$ (0.10)	$ 1.78	$ 0.39	$ 1.72
Diluted (in dollars per share)	$ (0.10)	$ 0.19	$ 0.38	$ 0.43
ACMI Services [Member]
REVENUES	$ 300,189	$ 272,188	$ 871,958	$ 785,082