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Business Segments (Principal Geographical Areas) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,193,068 | $ 1,199,505 | $ 1,247,274 | $ 1,117,361 | $ 1,246,599 | $ 1,332,978 | $ 1,308,130 | $ 1,085,369 | $ 4,757,208 | $ 4,973,076 | $ 4,920,472
Assets | 4,264,123 |  |  |  | 4,038,620 |  |  |  | 4,264,123 | 4,038,620 |
United States |  |  |  |  |  |  |  |  |  |  |
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,613,644 | 4,802,393 | 4,694,165
Assets | 4,093,673 |  |  |  | 3,911,865 |  |  |  | 4,093,673 | 3,911,865 |
Foreign and U.S. Territories [Member] |  |  |  |  |  |  |  |  |  |  |
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 143,564 | 170,683 | $ 226,307
Assets | $ 170,450 |  |  |  | $ 126,755 |  |  |  | $ 170,450 | $ 126,755 |

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