GOODWILL AND OTHER INTANGIBLE ASSETS

Amortization of intangible assets for the three months ended March 31, 2019 and 2018 was $13.1 million and $10.4 million, respectively. Amortization of intangible assets is estimated to be approximately $38 million for the remainder of 2019, $48 million in 2020, $43 million in 2021, $37 million in 2022, $30 million in 2023 and $54 million thereafter.

The changes in the carrying amount of goodwill, by segment, were as follows:



(in thousands)	Education			Television Broadcasting		Healthcare		Other Businesses			Total
Balance as of December 31, 2018
Goodwill	$	1,128,699		$	190,815	$	69,626	$	255,024		$	1,644,164
Accumulated impairment losses	(331,151		)	—		—		(15,301		)	(346,452		)
	797,548			190,815		69,626		239,723			1,297,712
Acquisitions	—			—		—		33,062			33,062
Foreign currency exchange rate changes	9,048			—		—		—			9,048
Balance as of March 31, 2019
Goodwill	1,137,747			190,815		69,626		288,086			1,686,274
Accumulated impairment losses	(331,151		)	—		—		(15,301		)	(346,452		)
	$	806,596		$	190,815	$	69,626	$	272,785		$	1,339,822

The changes in carrying amount of goodwill at the Company’s education division were as follows:



(in thousands)	Kaplan International		Higher Education			Test Preparation			Professional (U.S.)			Total
Balance as of December 31, 2018
Goodwill	$	583,424	$	174,564		$	166,920		$	203,791		$	1,128,699
Accumulated impairment losses	—		(111,324		)	(102,259		)	(117,568		)	(331,151		)
	583,424		63,240			64,661			86,223			797,548
Foreign currency exchange rate changes	9,019		—			—			29			9,048
Balance as of March 31, 2019
Goodwill	592,443		174,564			166,920			203,820			1,137,747
Accumulated impairment losses	—		(111,324		)	(102,259		)	(117,568		)	(331,151		)
	$	592,443	$	63,240		$	64,661		$	86,252		$	806,596

Other intangible assets consist of the following:



		As of March 31, 2019						As of December 31, 2018
(in thousands)	Useful Life Range	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortized Intangible Assets
Student and customer relationships	2–10 years	$	283,114	$	123,154	$	159,960	$	282,761	$	114,429	$	168,332
Trade names and trademarks	2–10 years	87,464		42,136		45,328		87,285		39,825		47,460
Network affiliation agreements	10 years	17,400		3,843		13,557		17,400		3,408		13,992
Databases and technology	3–6 years	27,059		9,702		17,357		27,041		8,471		18,570
Noncompete agreements	2–5 years	1,094		869		225		1,088		838		250
Other	1–8 years	24,530		10,701		13,829		24,530		9,873		14,657
		$	440,661	$	190,405	$	250,256	$	440,105	$	176,844	$	263,261
Indefinite-Lived Intangible Assets
Trade names and trademarks		$	81,607					$	80,102
Franchise agreements		28,000						—
FCC licenses		18,800						18,800
Licensure and accreditation		150						150
		$	128,557					$	99,052