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Business Segments (Principal Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,183,284 | $ 1,123,137 | $ 1,120,085 | $ 1,028,156 | $ 1,193,068 | $ 1,199,505 | $ 1,247,274 | $ 1,117,361 | $ 4,454,662 | $ 4,757,208 | $ 4,973,076
Assets | 4,387,752 |  |  |  | 4,264,123 |  |  |  | 4,387,752 | 4,264,123 |
United States |  |  |  |  |  |  |  |  |  |  |
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,180,206 | 4,613,644 | 4,802,393
Assets | 4,225,143 |  |  |  | 4,093,673 |  |  |  | 4,225,143 | 4,093,673 |
Foreign and U.S. Territories [Member] |  |  |  |  |  |  |  |  |  |  |
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 274,456 | 143,564 | $ 170,683
Assets | $ 162,609 |  |  |  | $ 170,450 |  |  |  | $ 162,609 | $ 170,450 |

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