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Accumulated Other Comprehensive Income (Tables) | 12 Months Ended
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Dec. 31, 2017
Text Block1 [Abstract] |
Summary of Accumulated Other Comprehensive Income |
|  | Unrealized Foreign Currency Translation Gains (Losses) |  |  | Foreign Exchange Gain (Loss) on Net Investment Hedge |  |  | Accumulated Other Comprehensive Income |
December 31, 2015 |  | $ | 663,886 |  |  | $ | (497,785 | ) |  | $ | 166,101 |
Other comprehensive loss |  |  | (76,608 | ) |  |  | 66,963 |  |  |  | (9,645 | )
December 31, 2016 |  |  | 587,278 |  |  |  | (430,822 | ) |  |  | 156,456 |
Other comprehensive loss |  |  | (146,545 | ) |  |  | 121,699 |  |  |  | (24,846 | )
December 31, 2017 |  | $ | 440,733 |  |  | $ | (309,123 | ) |  | $ | 131,610 |

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