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Stockholders' Equity - Stock Compensation - Management Incentive Plan (Details)
12 Months Ended
May 18, 2016
multiplier
shares
Dec. 31, 2020
shares
Stock Options    
Stock Compensation    
Vesting period   3 years
Life of options (expiration period)   10 years
Restricted Stock Units (RSUs)    
Stock Compensation    
Vesting period   3 years
Performance Based Restricted Stock Units ("PSUs")    
Stock Compensation    
Vesting period   3 years
2016 Management Incentive Plan    
Stock Compensation    
Maximum number of shares available (in shares) 4,000,000  
Multiplier for delivery of shares under full-value awards | multiplier 1.60  
Number of shares available for grant   2,058,875