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Stock-based Compensation - Performance-Based RSUs (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 12 Months Ended
Mar. 31, 2020
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Weighted-average grant date fair value per unit:        
Compensation expense recorded during the year | $   $ 24,771 $ 25,251 $ 20,697
Performance-based RSUs        
Summary of equity award grants, RSUs        
Balance at beginning of year (in units)   1,892,000 2,389,000 2,475,000
Granted (in units)   682,000 524,000 694,000
Vested (in units) (603,000) (735,000) (730,000) (446,000)
Forfeited or canceled (in units)   (32,000) (291,000) (334,000)
Balance at end of year (in units)   1,807,000 1,892,000 2,389,000
Weighted-average grant date fair value per unit:        
Outstanding at beginning of year (in dollars per share) | $ / shares   $ 14.48 $ 15.57 $ 14.24
Granted (in dollars per share) | $ / shares   23.11 24.40 18.04
Vested (in dollars per share) | $ / shares   11.28 12.86 13.65
Forfeited (in dollars per share) | $ / shares   21.72 16.17 14.45
Outstanding at end of year (in dollars per share) | $ / shares   $ 21.67 $ 14.48 $ 15.57
Compensation expense recorded during the year | $   $ 14,820 $ 12,425 $ 11,020
Actually vested (in shares)   648,000 774,000  
Vesting percentage   88 106  
Unamortized compensation cost | $   $ 14,252    
Number of shares expected to vest (in units)   1,596,000    
Weighted average remaining vesting period (in months)   12 months    
Minimum | Performance-based RSUs        
Stock-Based Compensation        
Shares earned as a percent of performance goal achievement   0.00%    
Expected grantee forfeiture rate (as a percent)   0.00%    
Maximum | Performance-based RSUs        
Stock-Based Compensation        
Shares earned as a percent of performance goal achievement   130.00%    
Expected grantee forfeiture rate (as a percent)   23.20%