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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, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 1,246,599 | $ 1,332,978 | $ 1,308,130 | $ 1,085,369 | $ 1,200,830 | $ 1,340,739 | $ 1,312,438 | $ 1,066,465 | $ 4,973,076 | $ 4,920,472 | $ 4,492,309
Assets | 4,038,620 |  |  |  | 3,861,300 |  |  |  | 4,038,620 | 3,861,300 |
United States [Member] |  |  |  |  |  |  |  |  |  |  |
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,802,393 | 4,694,165 | 4,323,471
Assets | 3,911,865 |  |  |  | 3,687,973 |  |  |  | 3,911,865 | 3,687,973 |
Foreign and U.S. Territories [Member] |  |  |  |  |  |  |  |  |  |  |
Principal Geographical Areas Information |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 170,683 | 226,307 | $ 168,838
Assets | $ 126,755 |  |  |  | $ 173,327 |  |  |  | $ 126,755 | $ 173,327 |

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