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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
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Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Revenues | $ 405,057 | $ 408,682 | $ 404,830 | $ 405,598 | $ 408,219 | $ 386,018 | $ 372,331 | $ 359,984 | $ 1,624,167 | $ 1,526,552 | $ 1,401,545
Assets | 1,971,668 |  |  |  | 1,853,369 |  |  |  | 1,971,668 | 1,853,369 |
United States |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,348,130 | 1,298,381 | 1,191,640
Assets | 1,612,202 |  |  |  | 1,471,260 |  |  |  | 1,612,202 | 1,471,260 |
International operations |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 276,037 | 228,171 | $ 209,905
Assets | $ 359,466 |  |  |  | $ 382,109 |  |  |  | $ 359,466 | $ 382,109 |

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