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Reclassifications for Accounting Pronouncements (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income Tax Expense (Benefit) | $ 22,470 | $ 20,636 | $ 53,146 | $ 53,335
Accounting Standards Update 2016-09 [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Income Tax Expense (Benefit) |  |  | $ 5,372 |

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