Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Fair Value Adjustment of Warrants	$ (35,000)
REVENUES	254,101	$ 193,261	$ 745,229	$ 547,195
Net earnings (loss) from continuing operations	(28,229)	2,116	(72,351)	21,815
EARNINGS (LOSS) FROM DISCONTINUED OPERATIONS, NET OF TAXES	$ (4,655)	$ 47	$ (4,271)	$ 141
Weighted average shares:
Basic (in shares)	58,733	59,379	58,965	62,084
Diluted (in shares)	58,733	60,283	58,965	64,024
Earnings per share from continuing operations
Basic (in dollars per share)	$ (0.48)	$ 0.04	$ (1.23)	$ 0.35
Diluted (in dollars per share)	$ (0.48)	$ 0.04	$ (1.23)	$ 0.34
ACMI Services [Member]
REVENUES	$ 146,943	$ 128,702	$ 436,391	$ 357,803