9.INTANGIBLE ASSETS, NET

Intangible assets, exclusive of goodwill, consisted of the following at September 30, 2018:


	Gross Carrying Amount		Accumulated Amortization			Accumulated Impairment Loss	Net Carrying Amount
Finite-lived intangible assets:
Long-term franchise agreements and contracts	$	483,749	$	(150,691)	$	-	$	333,058
Customer lists		429,801		(219,104)		-		210,697
Permits and other		349,207		(46,120)		-		303,087
		1,262,757		(415,915)		-		846,842
Indefinite-lived intangible assets:
Solid waste collection and transportation permits		158,591		-		-		158,591
Material recycling facility permits		42,283		-		-		42,283
E&P facility permits		59,855		-		(38,507)		21,348
		260,729		-		(38,507)		222,222
Intangible assets, exclusive of goodwill	$	1,523,486	$	(415,915)	$	(38,507)	$	1,069,064

The weighted-average amortization period of long-term franchise agreements and contracts acquired during the nine months ended September 30, 2018 was 16.3 years. The weighted-average amortization period of customer lists acquired during the nine months ended September 30, 2018 was 10.0 years. The weighted-average amortization period of finite-lived permits and other intangibles acquired during the nine months ended September 30, 2018 was 40.0 years.

Intangible assets, exclusive of goodwill, consisted of the following at December 31, 2017:


	Gross Carrying Amount		Accumulated Amortization			Accumulated Impairment Loss	Net Carrying Amount
Finite-lived intangible assets:
Long-term franchise agreements and contracts	$	481,293	$	(123,591)	$	-	$	357,702
Customer lists		405,683		(180,440)		-		225,243
Permits and other		317,984		(35,715)		-		282,269
		1,204,960		(339,746)		-		865,214
Indefinite-lived intangible assets:
Solid waste collection and transportation permits		158,591		-		-		158,591
Material recycling facility permits		42,283		-		-		42,283
E&P facility permits		59,855		-		(38,507)		21,348
		260,729		-		(38,507)		222,222
Intangible assets, exclusive of goodwill	$	1,465,689	$	(339,746)	$	(38,507)	$	1,087,436

Estimated future amortization expense for the next five years relating to finite-lived intangible assets is as follows:


For the year ending December 31, 2018	$	105,991
For the year ending December 31, 2019	$	95,653
For the year ending December 31, 2020	$	85,751
For the year ending December 31, 2021	$	75,561
For the year ending December 31, 2022	$	65,904