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Stock-Based Compensation (Summary of Stock-Based Compensation Expense) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated stock-based compensation expense | $ 127,762 | $ 110,294 | $ 120,379
Cost of recurring [Member] |  |  |
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated stock-based compensation expense | 14,052 | 11,258 | 12,405
Cost of one-time services and other [Member] |  |  |
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated stock-based compensation expense | 2,606 | 3,178 | 7,547
Total included in cost of revenue [Member] |  |  |
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated stock-based compensation expense | 16,658 | 14,436 | 19,952
Sales, marketing and customer success [Member] |  |  |
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated stock-based compensation expense | 24,892 | 21,409 | 20,283
Research and development [Member] |  |  |
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated stock-based compensation expense | 30,780 | 24,207 | 27,080
General and administrative [Member] |  |  |
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated stock-based compensation expense | 55,432 | 50,242 | 53,064
Total included in operating expenses [Member] |  |  |
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |
Allocated stock-based compensation expense | $ 111,104 | $ 95,858 | $ 100,427

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479830/718-10-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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