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Segment and Geographic Information - Non-cash items (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Non cash items included in segment income (loss) from operations by reportable segment |  |  |
Depreciation and amortization | $ 63,124 | $ 103,416 | $ 109,154
Amortization of intangible assets | 14,350 | 51,495 | 64,225
Stock-based compensation | 21,792 | 18,149 | 14,610
Segments | U.S. Higher Education |  |  |
Non cash items included in segment income (loss) from operations by reportable segment |  |  |
Depreciation and amortization | 35,863 | 38,178 | 41,822
Stock-based compensation | 19,572 | 16,926 | 14,452
Segments | Australia / New Zealand |  |  |
Non cash items included in segment income (loss) from operations by reportable segment |  |  |
Depreciation and amortization | 8,842 | 10,640 | 1,930
Stock-based compensation | 1,073 | 1,359 | 46
Segments | Education Technology Services |  |  |
Non cash items included in segment income (loss) from operations by reportable segment |  |  |
Depreciation and amortization | 1,589 | 1,067 | 828
Stock-based compensation | 1,147 | 567 | 112
Segment Reconciling Items |  |  |
Non cash items included in segment income (loss) from operations by reportable segment |  |  |
Amortization of intangible assets | 14,350 | 51,495 | 64,225
Restructuring costs | 2,480 | 2,036 | 349
Restructuring costs | $ 0 | $ (703) | $ 0

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- Definition The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI https://asc.fasb.org/extlink&oid=126954810&loc=d3e3602-108585 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(2) -URI https://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 45 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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