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Stock-Based Compensation Plans - Schedule of Outstanding Stock-based Compensation Awards (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unearned Compensation $ 20,661
Weighted-Average Remaining Period (in years) 2 years 6 months
RSUs  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unearned Compensation $ 14,393
Weighted-Average Remaining Period (in years) 2 years 8 months 12 days
PSUs  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unearned Compensation $ 6,133
Weighted-Average Remaining Period (in years) 2 years 2 months 12 days
ESPP  
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Unearned Compensation $ 135
Weighted-Average Remaining Period (in years) 3 months 18 days