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Segment Information and Revenue - Depreciation and Amortization Expense and Share-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Depreciation and amortization |  |  | $ 57,882 | $ 55,199
Share-based compensation |  |  | 152,068 | 96,146
Homes segment |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Depreciation and amortization | $ 4,733 | $ 2,597 | 9,026 | 6,172
Share-based compensation | 20,495 | 12,728 | 36,416 | 24,032
IMT |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Depreciation and amortization | 22,157 | 22,038 | 44,956 | 45,815
Share-based compensation | 58,362 | 35,958 | 99,754 | 65,505
Mortgages segment |  |  |  |
Segment Reporting, Revenue Reconciling Item [Line Items] |  |  |  |
Depreciation and amortization | 2,093 | 1,538 | 3,900 | 3,212
Share-based compensation | $ 9,538 | $ 3,665 | $ 15,898 | $ 6,609

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