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Stock-Based Compensation Plans - Schedule of Stock-based Compensation Expense (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Stock-based compensation expense $ 9,423 $ 2,627
Income tax benefit related to stock-based compensation expense $ 1,222 $ 643