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Fair Value Measurements and Derivative Instruments - Non-Derivative Net Investment (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Foreign currency debt |  |  |  |
Net investment hedge |  |  |  |
Amount of Gain (Loss) Recognized in Other Comprehensive Income (Loss) (Effective Portion) | $ 21,888 | $ 4,695 | $ 26,257 | $ 4,695

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