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		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 9,675	$ 9,196	$ 18,968	$ 18,595
Estimated amortization expense
Remainder of 2019	19,257		19,257
2020	28,941		28,941
2021	15,421		15,421
2022	15,421		15,421
2023	12,808		12,808
Thereafter	8,546		8,546
Finite-lived intangibles, Net	100,394		100,394		$ 98,347
NAST
Estimated amortization expense
Remainder of 2019	3,907		3,907
2020	250		250
2021	250		250
2022	250		250
2023	250		250
Thereafter	164		164
Global Forwarding
Estimated amortization expense
Remainder of 2019	15,040		15,040
2020	28,071		28,071
2021	14,551		14,551
2022	14,551		14,551
2023	11,938		11,938
Thereafter	6,884		6,884
All Other and Corporate
Estimated amortization expense
Remainder of 2019	310		310
2020	620		620
2021	620		620
2022	620		620
2023	620		620
Thereafter	$ 1,498		$ 1,498