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Stock-Based Compensation (Summary of Stock-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
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated stock-based compensation expense | $ 30,549 | $ 20,133 | $ 60,554 | $ 33,713
Cost of recurring [Member] |  |  |  |
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated stock-based compensation expense | 3,492 | 1,151 | 5,903 | 1,621
One-time services and other [Member] |  |  |  |
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated stock-based compensation expense | 1,745 | 1,419 | 4,692 | 1,814
Total included in cost of revenue [Member] |  |  |  |
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated stock-based compensation expense | 5,237 | 2,570 | 10,595 | 3,435
Sales, marketing and customer success [Member] |  |  |  |
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated stock-based compensation expense | 4,678 | 3,603 | 10,106 | 6,081
Research and development [Member] |  |  |  |
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated stock-based compensation expense | 6,901 | 4,348 | 13,615 | 7,147
General and administrative [Member] |  |  |  |
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated stock-based compensation expense | 13,733 | 9,612 | 26,238 | 17,050
Total included in operating expenses [Member] |  |  |  |
Employee Service Stock-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Allocated stock-based compensation expense | $ 25,312 | $ 17,563 | $ 49,959 | $ 30,278

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