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Stock Plans - Schedule of Stock Compensation Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]    
Stock compensation expense $ 2,745 $ 5,606
Income tax benefit 670 1,362
Stock compensation expense, net of income tax benefit $ 2,075 $ 4,244