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Segment and Geographic Information - Non-cash items (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Non cash items included in segment income (loss) from operations by reportable segment |  |  |
Depreciation and amortization | $ 103,416 | $ 109,154 | $ 104,861
Amortization of intangible assets | 51,495 | 64,225 | 61,667
Stock-based compensation | 18,149 | 14,610 | 12,160
Segments | U.S. Higher Education |  |  |
Non cash items included in segment income (loss) from operations by reportable segment |  |  |
Depreciation and amortization | 38,178 | 41,822 | 41,962
Stock-based compensation | 16,926 | 14,452 | 11,445
Segments | Australia / New Zealand |  |  |
Non cash items included in segment income (loss) from operations by reportable segment |  |  |
Depreciation and amortization | 10,640 | 1,930 | 0
Stock-based compensation | 1,359 | 46 | 0
Segments | Education Technology Services |  |  |
Non cash items included in segment income (loss) from operations by reportable segment |  |  |
Depreciation and amortization | 1,067 | 828 | 831
Stock-based compensation | 567 | 112 | 348
Segment Reconciling Items |  |  |
Non cash items included in segment income (loss) from operations by reportable segment |  |  |
Amortization of intangible assets | 51,495 | 64,225 | 61,667
Merger and integration costs | 0 | 0 | 401
Merger and integration costs | 0 | 0 | 367
Restructuring costs | 2,036 | 349 | 0
Restructuring costs | $ (703) | $ 0 | $ 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 http://asc.fasb.org/extlink&oid=123570139&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 http://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 http://asc.fasb.org/extlink&oid=6388964&loc=d3e16225-109274 + Details
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