Quarterly Results (Unaudited) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
REVENUES	$ 193,261	$ 142,305	$ 547,195	$ 437,683
Net earnings from continuing operations	2,116	6,347	21,815	25,812
EARNINGS FROM DISCONTINUED OPERATIONS, NET OF TAXES	$ 47	$ 214	$ 141	$ 642
Weighted average shares:
Basic (in shares)	59,379	64,239	62,084	64,411
Diluted (in shares)	60,283	65,171	64,024	65,341
Earnings (loss) per share from continuing operations
Basic (in dollars per share)	$ 0.04	$ 0.10	$ 0.35	$ 0.40
Diluted (in dollars per share)	$ 0.04	$ 0.10	$ 0.34	$ 0.40
ACMI Services [Member]
REVENUES	$ 128,702	$ 99,918	$ 357,803	$ 309,278