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Accounting Policies PP&E (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | $ 557,881 | $ 530,613 |
Accumulated Depreciation, Depletion and Amortization, Property, Plant, and Equipment | 360,457 | 330,621 |
Property and equipment, net of accumulated depreciation | 197,424 | 199,992 |
Capitalized Computer Software, Amortization | 13,800 | 13,200 | $ 10,900
Capitalized Computer Software, Net | 33,300 | 33,700 |
Land [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | 6,215 | 6,215 |
Building and Building Improvements [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | $ 217,274 | 207,740 |
Building and Building Improvements [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Building and Building Improvements [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 30 years |  |
Computer hardware and software [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | $ 145,206 | 141,856 |
Computer hardware and software [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 2 years |  |
Computer hardware and software [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Software Development [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | $ 137,337 | 123,967 |
Software Development [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 3 years |  |
Software Development [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Furniture and Fixtures [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Gross | $ 51,849 | $ 50,835 |
Furniture and Fixtures [Member] | Minimum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 5 years |  |
Furniture and Fixtures [Member] | Maximum [Member] |  |  |
Property, Plant and Equipment [Line Items] |  |  |
Property, Plant and Equipment, Useful Life | 7 years |  |

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