GOODWILL AND OTHER INTANGIBLE ASSETS

The change in carrying amount of goodwill is as follows (in thousands):



	NAST			Global Forwarding			Robinson Fresh			All Other and Corporate			Total
December 31, 2017 balance	$	921,486		$	185,873		$	141,185		$	27,272		$	1,275,816
Acquisitions	—			301			—			—			301
Adjustments	(40		)	(268		)	—			—			(308		)
Translation	(7,312		)	(1,948		)	(1,109		)	(214		)	(10,583		)
September 30, 2018 balance	$	914,134		$	183,958		$	140,076		$	27,058		$	1,265,226

Goodwill is tested at least annually for impairment on November 30, or more frequently if events or changes in circumstances indicate that the asset might be impaired. We first perform a qualitative assessment to determine whether it is more likely than not that the fair value of our reporting units is less than their respective carrying value (“Step Zero Analysis”). If the Step Zero Analysis indicates it is more likely than not that the fair value of our reporting units is less than their respective carrying value, an additional impairment assessment is performed (“Step One Analysis”). Refer to Critical Accounting Policies and Estimates.

Identifiable intangible assets consisted of the following (in thousands):



	September 30, 2018							December 31, 2017
	Cost		Accumulated Amortization			Net		Cost		Accumulated Amortization			Net
Finite-lived intangibles
Customer relationships	$	261,662	$	(151,996	)	$	109,666	$	263,093	$	(122,103	)	$	140,990
Non-competition agreements	300		(225		)	75		300		(180		)	120
Total finite-lived intangibles	261,962		(152,221		)	109,741		263,393		(122,283		)	141,110

Indefinite-lived intangibles
Trademarks	10,475		—			10,475		10,475		—			10,475
Total intangibles	$	272,437	$	(152,221	)	$	120,216	$	273,868	$	(122,283	)	$	151,585

Amortization expense for other intangible assets is as follows (in thousands):



	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Amortization expense	$	9,201	$	9,157	$	27,796	$	26,875

Definite-lived intangible assets, by reportable segment, as of September 30, 2018, will be amortized over their remaining lives as follows (in thousands):



	NAST		Global Forwarding		Robinson Fresh		All Other and Corporate		Total
Remainder of 2018	$	1,953	$	7,455	$	—	$	—	$	9,408
2019	7,820		29,445		—		—		37,265
2020	260		26,741		—		—		27,001
2021	260		13,220		—		—		13,480
2022	260		13,220		—		—		13,480
Thereafter	461		8,646		—		—		9,107
Total									$	109,741