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Stock-based Compensation - Other (Details) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Stock-Based Compensation        
Units available for future awards under 2013 Equity Incentive Plan (in units)   4,200,000    
Stock-based compensation expense   $ 24,771 $ 25,251 $ 20,697
Stock Options        
Stock-Based Compensation        
Granted (in units)   344,000 674,000 861,000
Stock-based compensation expense   $ 3,292 $ 6,218 $ 4,909
Performance-based RSUs        
Stock-Based Compensation        
Granted (in units)   682,000 524,000 694,000
Vested (in units) 603,000 735,000 730,000 446,000
Stock-based compensation expense   $ 14,820 $ 12,425 $ 11,020
Time-based RSUs        
Stock-Based Compensation        
Granted (in units)   334,000 328,000 408,000
Vested (in units)   300,000 254,000 173,000
Stock-based compensation expense   $ 6,659 $ 6,608 $ 4,768
Minimum | Stock Options        
Stock-Based Compensation        
Expected grantee forfeiture rate (as a percent)   2.30% 0.00% 0.00%
Minimum | Performance-based RSUs        
Stock-Based Compensation        
Expected grantee forfeiture rate (as a percent)   0.00%    
Shares earned as a percent of performance goal achievement   0.00%    
Maximum | Stock Options        
Stock-Based Compensation        
Expected grantee forfeiture rate (as a percent)   22.70% 23.20% 21.10%
Maximum | Performance-based RSUs        
Stock-Based Compensation        
Expected grantee forfeiture rate (as a percent)   23.20%    
Shares earned as a percent of performance goal achievement   130.00%