Quarterly report pursuant to Section 13 or 15(d)

SHARE-BASED COMPENSATION AND OTHER EMPLOYEE BENEFIT PLANS - Narrative (Details)

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SHARE-BASED COMPENSATION AND OTHER EMPLOYEE BENEFIT PLANS - Narrative (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 5 Months Ended 9 Months Ended
Jun. 11, 2020
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock based compensation expense   $ 2.2   $ 9.4
Expected employer contributions   $ 17.6   17.6
Employer contributions       $ 11.6
Restricted Preferred Stock | Management Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)     188,210  
Restricted stock awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)       413,035
Restricted stock awards | Management Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares) 656,617   312,606  
Shares vested (in shares) 73,131      
Shares forfeited (in shares) 227,884      
Restricted stock awards | 2012 Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares consolidated from Era Group (in shares) 151,768      
Restricted stock awards | Annual Director Awards        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)       44,946
Grant date fair value (in dollars per share)   $ 15.76   $ 15.76
Performance restricted stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)       161,668
Vesting period       3 years
Performance restricted stock | Period One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)       150,001
Grant date fair value (in dollars per share)   7.73   $ 7.73
Performance restricted stock | Period Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)       11,667
Grant date fair value (in dollars per share)   24.54   $ 24.54
Non-performance Restricted Stock        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (in shares)       206,421
Grant date fair value (in dollars per share)   $ 19.41   $ 19.41
Preferred Stock Options | Management Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted (in shares)     113,081  
Common Stock Options | Management Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted (in shares)     265,049  
Options vested (in shares) 48,448      
Options forfeited (in shares) 151,307      
Stock options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted (in shares)       161,668
Options forfeited (in shares) 145,263      
Vesting period       3 years
Stock options | Period One        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted (in shares)       150,001
Weighted average grant-date fair value of options granted (in dollars per share)       $ 10.99
Stock options | Period Two        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted (in shares)       11,667
Weighted average grant-date fair value of options granted (in dollars per share)       $ 14.56
Stock options | Management Incentive Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Shares granted (in shares) 433,283