The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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GOODWILL AND OTHER INTANGIBLE ASSETS - Amortization Expense and Future Amortization (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 9,731	$ 9,201	$ 28,699	$ 27,796
Estimated amortization expense
Remainder of 2019	9,562		9,562
2020	28,426		28,426
2021	14,905		14,905
2022	14,905		14,905
2023	12,335		12,335
Thereafter	8,075		8,075
Total	88,208		88,208		$ 98,347
NAST
Estimated amortization expense
Remainder of 2019	1,952		1,952
2020	247		247
2021	247		247
2022	247		247
2023	247		247
Thereafter	164		164
Global Forwarding
Estimated amortization expense
Remainder of 2019	7,543		7,543
2020	27,584		27,584
2021	14,063		14,063
2022	14,063		14,063
2023	11,493		11,493
Thereafter	6,391		6,391
All Other and Corporate
Estimated amortization expense
Remainder of 2019	67		67
2020	595		595
2021	595		595
2022	595		595
2023	595		595
Thereafter	$ 1,520		$ 1,520