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Business Segment Information (Schedule of Revenues And Assets Based On Location) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 423,225 | $ 416,254 | $ 409,586 | $ 400,820 | $ 405,057 | $ 408,682 | $ 404,830 | $ 405,598 | $ 1,649,885 | $ 1,624,167 | $ 1,526,552
Assets | 2,151,370 |  |  |  | 1,971,668 |  |  |  | 2,151,370 | 1,971,668 |
United States |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,385,744 | 1,348,130 | 1,298,381
Assets | 1,732,427 |  |  |  | 1,612,202 |  |  |  | 1,732,427 | 1,612,202 |
International operations |  |  |  |  |  |  |  |  |  |  |
Revenues from External Customers and Long-Lived Assets [Line Items] |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 264,141 | 276,037 | $ 228,171
Assets | $ 418,943 |  |  |  | $ 359,466 |  |  |  | $ 418,943 | $ 359,466 |

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