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Stock-Based Compensation Schedule of Weighted Average Fair Value and Intrinsic Value (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value $ 9,687 $ 2,815 $ 5,203