XML 153 R128.htm IDEA: XBRL DOCUMENT v3.20.4
Share-based Compensation - Summary of Activity in Options (Details) - 2015 Management Incentive Plan - $ / shares
 9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Options          
Outstanding at beginning of period (in shares) 7,738,000 3,233,779 3,486,150 7,738,000  
Granted (in shares)   0 156,129 0  
Exercised (in shares)   (909,627) (353,500) (4,168,100)  
Forfeited or expired (in shares)   0 (55,000) (83,750)  
Outstanding at end of period (in shares)   2,324,152 3,233,779 3,486,150 7,738,000
Weighted Average Exercise Price Per Share          
Outstanding at beginning of period (in dollars per share) $ 19.00 $ 18.74 $ 19.00 $ 19.00  
Granted (in dollars per share)   0 13.60 0  
Exercised (in dollars per share)   18.07 19.00 19.00  
Forfeited or expired (in dollars per share) $ 0 0 0 0  
Outstanding at end of period (in dollars per share)   $ 19.00 $ 18.74 $ 19.00 $ 19.00
Weighted Average Remaining Contractual Life          
Weighted Average Remaining Contractual Life   4 years 2 months 26 days 5 years 2 months 26 days 6 years 3 months 18 days 7 years 3 months 14 days
Weighted Average Remaining Contractual Life, Granted     4 years 4 months 13 days    
Options Exercisable, Number of Options (in shares)   2,324,152 3,248,779 1,660,400 3,869,000
Options Granted, Number of Options (in shares)   0 156,129 0  
Options Exercised, Number of Options Exercised (in shares)   (909,627) (353,500) 0  
Options Exercisable, Number of Options Forfeited or Expired (in shares)   0 0 0  
Options Exercisable, Weighted Average Exercise Price (in dollars per share)   $ 19.00 $ 18.74 $ 19.00 $ 19.00