GOODWILL AND OTHER INTANGIBLE ASSETS

12 Months Ended

Dec. 31, 2019

Goodwill and Intangible Assets Disclosure [Abstract]

The changes in the carrying amount of goodwill for the two years ended December 31, 2019 are as follows:



	Enterprise Software		Appraisal and Tax		Total
Balance as of 12/31/2017	$	651,430	$	6,557	$	657,987
Goodwill acquired related to the purchase of Socrata	75,657		—		75,657
Goodwill acquired related to other acquisitions	20,074		—		20,074
Balance as of 12/31/2018	747,161		6,557		753,718
Goodwill acquired related to the purchase of MicroPact	76,319		—		76,319
Goodwill acquired related to other acquisitions	10,080		—		10,080
Balance as of 12/31/2019	$	833,560	$	6,557	$	840,117

Other intangible assets and related accumulated amortization consists of the following at December 31:



	2019			2018
Gross carrying amount of other intangibles:
Customer related intangibles	$	321,019		$	238,219
Acquired software	262,286			202,416
Trade names	22,905			16,905
Capitalized software development costs	4,804			—
Leases acquired	5,037			3,694
	616,051			461,234
Accumulated amortization	(237,137		)	(184,382		)
Total other intangibles, net	$	378,914		$	276,852

Amortization expense for acquired software and capitalized software development costs are recorded to cost of revenues. Amortization expense for customer relationships and trade names are recorded to selling, general and administrative expenses. Total amortization expense for other intangibles was $52.8 million in 2019, $39.6 million in 2018, and $35.5 million in 2017.

The amortization periods of other intangible assets is summarized in the following table:



	December 31, 2019					December 31, 2018
	Gross Carrying Amount		Weighted Average Amortization Period	Accumulated Amortization		Gross Carrying Amount		Weighted Average Amortization Period	Accumulated Amortization
Non-amortizable intangibles:
Goodwill	$	840,117	—	$	—	$	753,718	—	$	—
Amortizable intangibles:
Customer related intangibles	321,019		16 years	97,320		238,219		15 years	78,120
Acquired software	262,286		7 years	130,416		202,416		7 years	99,772
Trade names	22,905		11 years	7,205		16,905		11 years	5,139
Capitalized software development costs	$	4,804	5 years	$	296	$	—	—	$	—
Leases acquired	5,037		9 years	1,900		3,694		10 years	1,351

Estimated annual amortization expense related to acquired leases will be recorded as a reduction to hardware and other revenue and is expected to be $525,000 in 2020, $525,000 in 2021, $525,000 in 2022, $525,000 in 2023, $525,000 in 2024, and $512,000 thereafter.

Estimated annual amortization expense related to other intangibles, including customer relationships, acquired software, trade names and capitalized software development costs is as follows:



2020	$	54,045
2021	53,687
2022	49,989
2023	31,838
2024	31,213
Thereafter	$	155,005