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Goodwill and Other Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Reconciliation of Changes in Carrying Value of Goodwill | A reconciliation of the changes in the carrying value of goodwill during the years ended December 31, 2022 and 2021 is as follows (dollars in thousands):
|  | As of December 31, |
|  | 2022 |  |  | 2021 |
|  | CTU |  |  | AIUS |  |  | Total |  |  | CTU |  |  | AIUS |  |  | Total |
Balance, beginning of year |  | $ | 73,728 |  |  | $ | 88,851 |  |  | $ | 162,579 |  |  | $ | 45,938 |  |  | $ | 72,374 |  |  | $ | 118,312 |
Business acquisitions |  |  | 59,405 |  |  |  | 21,556 |  |  |  | 80,961 |  |  |  | 27,790 |  |  |  | 16,477 |  |  |  | 44,267 |
Balance, end of year |  | $ | 133,133 |  |  | $ | 110,407 |  |  | $ | 243,540 |  |  | $ | 73,728 |  |  | $ | 88,851 |  |  | $ | 162,579 |
Schedule of Net Book Value of Intangible Assets Other Than Goodwill | As of December 31, 2022 and 2021, the net book value of intangible assets other than goodwill are as follows (dollars in thousands):
|  | December 31, 2022 |  |  | December 31, 2021 |  |
|  | Cost |  |  | Accumulated Amortization |  |  | Impairments |  |  | Net Book Value |  |  | Cost |  |  | Accumulated Amortization |  |  | Net Book Value |  |
Amortizable intangible assets: (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Course curriculum |  | $ | 2,790 |  |  | $ | (1,461 | ) |  | $ | - |  |  | $ | 1,329 |  |  | $ | 1,400 |  |  | $ | (856 | ) |  | $ | 544 |  |
Customer relationships |  |  | 38,090 |  |  |  | (10,815 | ) |  |  | (111 | ) |  |  | 27,164 |  |  |  | 22,300 |  |  |  | (5,588 | ) |  |  | 16,712 |  |
Developed technology |  |  | 8,820 |  |  |  | (1,022 | ) |  |  | (461 | ) |  |  | 7,337 |  |  |  | 2,790 |  |  |  | (278 | ) |  |  | 2,512 |  |
Trade names |  |  | 13,060 |  |  |  | (2,683 | ) |  |  | (543 | ) |  |  | 9,834 |  |  |  | 6,480 |  |  |  | (1,940 | ) |  |  | 4,540 |  |
Net book value, amortizable intangible assets: |  | $ | 62,760 |  |  | $ | (15,981 | ) |  | $ | (1,115 | ) |  | $ | 45,664 |  |  | $ | 32,970 |  |  | $ | (8,662 | ) |  | $ | 24,308 |  |
Non-amortizable intangible assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accreditation rights |  |  |  |  |  |  |  |  |  |  | $ | 1,000 |  |  |  |  |  |  |  |  | $ | 1,000 |  |
CTU trade name |  |  |  |  |  |  |  |  |  |  |  | 6,900 |  |  |  |  |  |  |  |  |  | 6,900 |  |
Non-amortizable intangible assets |  |  |  |  |  |  |  |  |  |  |  | 7,900 |  |  |  |  |  |  |  |  |  | 7,900 |  |
Intangible assets, net |  |  |  |  |  |  |  |  |  |  | $ | 53,564 |  |  |  |  |  |  |  |  | $ | 32,208 |  |
___________________ (1) See Note 3 "Business Acquisitions" for further details on acquired intangible assets.

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