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Business Segments - Revenue and Long-Lived Assets by Geographic Location (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Service revenues | $ 6,461,444 | $ 5,109,000 | $ 6,074,432
Assets, long-lived | 93,403 | 109,817 | 128,385
Domestic |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Service revenues | 5,006,525 | 3,984,742 | 4,708,715
Assets, long-lived | 76,757 | 88,117 | 99,365
Foreign |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |
Service revenues | 1,454,919 | 1,124,258 | 1,365,717
Assets, long-lived | $ 16,646 | $ 21,700 | $ 29,020

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