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Description of Business, Basis of Presentation, and Summary of Significant Accounting Policies - Property, Plant, and Equipment (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Property Plant And Equipment [Abstract] |  |
Data processing equipment and software | $ 68,447 | $ 60,227
Leasehold improvements | 16,531 | 14,077
Other, principally furniture and other equipment | 26,586 | 24,839
Total property, plant and equipment, Gross | 111,564 | 99,143
Accumulated depreciation | (75,568) | (71,044)
Net property and equipment | $ 35,996 | $ 28,099

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