Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Fair Value Adjustment of Warrants	$ 17,300	$ (35,000)	$ 25,000	$ (100,600)
REVENUES	204,919	254,101	611,566	745,229
Net earnings (loss) from continuing operations	32,933	(28,229)	73,079	(72,351)
EARNINGS (LOSS) FROM DISCONTINUED OPERATIONS, NET OF TAXES	$ 170	$ (4,655)	$ 536	$ (4,271)
Weighted average shares:
Basic (in shares)	58,739	58,733	58,773	58,965
Diluted (in shares)	68,323	58,733	68,629	58,965
Earnings per share from continuing operations
Basic (in dollars per share)	$ 0.56	$ (0.48)	$ 1.24	$ (1.23)
Diluted (in dollars per share)	$ 0.24	$ (0.48)	$ 0.71	$ (1.23)
ACMI Services [Member]
REVENUES	$ 116,224	$ 146,943	$ 355,204	$ 436,391