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Operations by Business Segment and Geographic Area - External Revenue and Total Assets by Geographic Area (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
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
Revenues from external customers and long lived assets |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 5,027,400 | $ 4,941,600 | $ 4,716,100 | $ 4,835,900 | $ 4,989,600 | $ 4,766,900 | $ 4,856,100 | $ 4,423,900 | $ 19,520,970 | $ 19,036,525 | $ 18,114,048
Assets | 9,327,692 |  |  |  | 9,216,417 |  |  |  | 9,327,692 | 9,216,417 |
U.S. |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers and long lived assets |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 10,071,100 | 9,891,900 | 7,857,300
Assets | 4,808,100 |  |  |  | 4,842,400 |  |  |  | 4,808,100 | 4,842,400 |
Canada |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers and long lived assets |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,447,500 | 2,170,100 | 2,459,300
Assets | 490,500 |  |  |  | 749,500 |  |  |  | 490,500 | 749,500 |
Asia Pacific (includes Australia) |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers and long lived assets |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 985,500 | 1,010,200 | 870,400
Assets | 729,300 |  |  |  | 645,800 |  |  |  | 729,300 | 645,800 |
Europe |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers and long lived assets |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,358,300 | 3,372,100 | 2,509,200
Assets | 2,238,000 |  |  |  | 2,103,700 |  |  |  | 2,238,000 | 2,103,700 |
Central and South America |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers and long lived assets |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 968,200 | 1,006,200 | 2,560,400
Assets | 675,000 |  |  |  | 499,700 |  |  |  | 675,000 | 499,700 |
Middle East and Africa |  |  |  |  |  |  |  |  |  |  |
Revenues from external customers and long lived assets |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 1,690,400 | 1,586,000 | $ 1,857,400
Assets | $ 386,800 |  |  |  | $ 375,300 |  |  |  | $ 386,800 | $ 375,300 |

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