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Accumulated Other Comprehensive Income (Schedule of Reclassifications out of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Provision for income taxes | $ 99,792 | $ 81,006 | $ 64,604
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 2,251 | 13,983 |
Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | 3,200 | 19,836 | 2,758
Provision for income taxes | 949 | 5,853 | 756
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax | 2,251 | 13,983 | 2,002
Interest Rate Swaps [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | (421) | (1,042) | (1,064)
Foreign Currency Exchange Contracts [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] |  |  |
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax | $ 3,621 | $ 20,878 | $ 3,822

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