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Geographic Information (Tables) | 12 Months Ended
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Dec. 31, 2015
Segments, Geographical Areas [Abstract] |
Revenues By Geographic Areas | Our revenues and long-lived assets related to the following geographic areas:
Revenues | 2015 |  | 2014 |  | 2013
United States | $ | 3,441,141 |  |  | 3,308,226 |  |  | 2,951,673 |
Canada | 223,270 |  |  | 238,590 |  |  | 227,756 |
Other foreign countries | 204,776 |  |  | 186,691 |  |  | 146,677 |
| $ | 3,869,187 |  |  | 3,733,507 |  |  | 3,326,106 |
Long-Lived Assets By Geographic Areas |
Long-Lived Assets | 2015 |  | 2014 |  | 2013
United States | $ | 821,063 |  |  | 725,189 |  |  | 632,783 |
Canada | 32,290 |  |  | 37,580 |  |  | 22,572 |
Other foreign countries | 14,333 |  |  | 13,068 |  |  | 11,968 |
| $ | 867,686 |  |  | 775,837 |  |  | 667,323 |

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