The changes made to the goodwill balances of our reporting units for the three months ended March 31, 2019 and the year ended December 31, 2018, were as follows (shown in thousands):

	Healthcare			Energy			Financial Services Advisory and Compliance			Total Company
Goodwill at December 31, 2018	$	294,283		$	80,034		$	48,040		$	422,357
Acquisitions		3,237			-			-			3,237
Adjustments		(2	)		-			(6	)		(8	)
Foreign currency translation		-			(58	)		(459	)		(517	)
Goodwill at March 31, 2019	$	297,518		$	79,976		$	47,575		$	425,069

	Healthcare			Energy			Financial Services Advisory and Compliance			Total Company
Goodwill at December 31, 2017	$	294,064		$	80,109		$	48,786		$	422,959
Adjustments		365			200			(24	)		541
Foreign currency translation		(146	)		(275	)		(722	)		(1,143	)
Goodwill at December 31, 2018	$	294,283		$	80,034		$	48,040		$	422,357

We performed our annual goodwill impairment test as of May 31, 2018 on our three continuing reporting units and our former Disputes, Forensics and Legal Technology reporting unit using certain key assumptions. The key assumptions included: internal projections completed during our first quarter 2018 forecasting process; profit margin improvement generally consistent with our longer-term historical performance; assumptions regarding contingent revenue; revenue growth consistent with our longer-term historical performance, also considering our near-term investment plans and growth objectives; discount rates based on comparable discount rates for our peer group; revenue and earnings before interest, taxes, depreciation and amortization (“EBITDA”) multiples comparable to multiples for our peer group; Navigant-specific risk considerations; control premium; and cost of capital based on our historical experience.

As of May 31, 2018, the estimated fair value of our Healthcare, Energy and Financial Services Advisory and Compliance reporting units exceeded the fair value of invested capital by 23%, 32%, and 72%, respectively.

We have reviewed our most recent financial projections and considered the impact of changes to our business and market conditions on our goodwill valuation and determined that no events or conditions have occurred or are expected to occur that would trigger a need to perform an interim goodwill impairment test on our remaining three reporting units. We will continue to monitor the factors and key assumptions used in determining the fair value of each of our continuing three reporting units. There can be no assurance that goodwill or intangible assets will not be impaired in the future. We will perform our next annual goodwill impairment test as of May 31, 2019.

	March 31,			December 31,
	2019			2018
Intangible assets:
Customer lists and relationships	$	108,555		$	105,368
Non-compete agreements		23,066			22,923
Other		28,450			28,304
Intangible assets, at cost		160,071			156,595
Less: accumulated amortization		(144,601	)		(142,429	)
Intangible assets, net	$	15,470		$	14,166

Our intangible assets have estimated remaining useful lives ranging up to six years which approximate the estimated periods of consumption. We will amortize the remaining net book values of intangible assets over their remaining useful lives. At March 31, 2019, our intangible assets categories were as follows (in thousands, except year data):

Category	Weighted Average Remaining Years		Amount
Customer lists and relationships, net		4.1	$	14,014
Non-compete agreements, net		2.2		1,018
Other intangible assets, net		3.3		438
Total intangible assets, net		3.9	$	15,470

Total amortization expense was $1.4 million and $1.8 million for the three months ended March 31, 2019 and 2018, respectively. The estimated annual aggregate amortization expense to be recorded related to intangible assets at March 31, 2019 is as follows (in thousands):

Year Ending December 31,	Amount
2019 (includes January - March)	$	5,393
2020		4,196
2021		4,085
2022		936
2023		1,243
2024 and thereafter		989