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Stockholders' Equity - Stock Option Activity (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
May 24, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance shares authorized (in shares)   0 0 0  
Income and payroll tax payments for net-settled stock awards   $ (7,809) $ (4,051) $ (14,127)  
Weighted average fair value (in dollars per share)   $ 38.64      
Stock Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance shares authorized (in shares)   0 0 6,366,000  
Total intrinsic value of options exercised   $ 5,100 $ 1,200 $ 28,500  
Aggregate intrinsic value, Options exercisable, end of period   $ 49,800      
Number of options, Options outstanding, end of year (in shares)   6,366,000 6,431,000 6,458,000  
Weighted average exercise price (in dollars per share)   $ 28.58 $ 28.34 $ 28.24 $ 4.99
Non-Vested Options          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of options, Options outstanding, end of year (in shares)   6,400,000      
Weighted average exercise price (in dollars per share)   $ 28.58      
Weighted average fair value (in dollars per share)   $ 38.64      
Weighted average remaining contractual life, Options outstanding, end of period   7 years 2 months 12 days      
Aggregate intrinsic value of unvested options   $ 598,100      
Performance Shares          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Performance shares authorized (in shares) 6,365,856        
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Shares withheld, for net share settlement of share based award (in shares)   100,000      
Income and payroll tax payments for net-settled stock awards   $ (6,600)      
Aggregate intrinsic value price per share (in dollars per share)   $ 122.53