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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract] |
Summary of Other Intangible Assets and Related Accumulated Amortization | Other intangible assets and related accumulated amortization consists of the following at December 31:
| 2018 |  | 2017
|  |  | As Adjusted
Gross carrying amount of acquisition intangibles: |  |  |
Customer related intangibles | $ | 238,219 |  |  | $ | 179,789 |
Acquired software | 202,416 |  |  | 179,466 |
Trade names | 16,905 |  |  | 11,435 |
Leases acquired | 3,694 |  |  | 3,694 |
| 461,234 |  |  | 374,384 |
Accumulated amortization | (184,382 | ) |  | (144,767 | )
Total intangibles, net | $ | 276,852 |  |  | $ | 229,617 |
Summary of Allocation of Acquisition Intangible Assets | The allocation of acquisition intangible assets is summarized in the following table:
| December 31, 2018 |  | December 31, 2017
|  |  |  |  |  |  |  |  | As Adjusted |  |
| Gross Carrying Amount |  | Weighted Average Amortization Period |  | Accumulated Amortization |  | Gross Carrying Amount |  | Weighted Average Amortization Period |  | Accumulated Amortization
Non-amortizable intangibles: |  |  |  |  |  |  |  |  |  |  |
Goodwill | $ | 753,718 |  |  | — |  |  | $ | — |  |  | $ | 657,987 |  |  | — |  |  | $ | — |
Amortizable intangibles: |  |  |  |  |  |  |  |  |  |  |
Customer related intangibles | 238,219 |  |  | 15 years |  |  | 78,120 |  |  | 179,789 |  |  | 15 years |  |  | 63,274 |
Acquired software | 202,416 |  |  | 7 years |  |  | 99,772 |  |  | 179,466 |  |  | 7 years |  |  | 76,800 |
Trade names | 16,905 |  |  | 11 years |  |  | 5,139 |  |  | 11,435 |  |  | 11 years |  |  | 3,768 |
Leases acquired | 3,694 |  |  | 10 years |  |  | 1,351 |  |  | 3,694 |  |  | 10 years |  |  | 925 |
Summary of Changes in Carrying Amount of Goodwill | The changes in the carrying amount of goodwill for the two years ended December 31, 2018 are as follows:
| Enterprise Software |  | Appraisal and Tax |  | Total
Balance as of 12/31/2016 | $ | 643,680 |  |  | $ | 6,557 |  |  | $ | 650,237 |
Goodwill acquired with acquisitions | 7,750 |  |  | — |  |  | 7,750 |
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 |
Summary of Estimated Annual Amortization Expense | Estimated annual amortization expense related to acquisition intangibles, including acquired software, for which the amortization expense is recorded as cost of revenues, is as follows:
2019 | $ | 40,222 |
2020 | 38,820 |
2021 | 38,463 |
2022 | 34,987 |
2023 | 16,990 |
Thereafter | 105,028 |

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- Definition Tabular disclosure of the characteristics, including initial carrying value, residual amount, weighted average useful life, of finite-lived intangible assets acquired during the period by major class. A major class is composed of intangible assets that can be grouped together because they are similar, either by nature or by their use in the operations of the company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 + Details
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