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Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2013
Segments, Geographical Areas [Abstract] |
Revenues By Geographic Areas |
Revenues | 2013 |  | 2012 |  | 2011
United States | $ | 2,951,673 |  |  | 2,798,124 |  |  | 2,474,805 |
Canada | 227,756 |  |  | 218,570 |  |  | 198,592 |
Other foreign countries | 146,677 |  |  | 116,883 |  |  | 93,462 |
| $ | 3,326,106 |  |  | 3,133,577 |  |  | 2,766,859 |
Long-Lived Assets By Geographic Areas |
Long-Lived Assets | 2013 |  | 2012 |  | 2011
United States | $ | 632,783 |  |  | 495,609 |  |  | 426,329 |
Canada | 22,572 |  |  | 15,954 |  |  | 11,105 |
Other foreign countries | 11,968 |  |  | 17,613 |  |  | 11,376 |
| $ | 667,323 |  |  | 529,176 |  |  | 448,810 |

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