Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation - Restricted Stock Units (Details)

v3.20.1
Stock-Based Compensation - Restricted Stock Units (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mar. 31, 2018
RSUs      
Shares      
Non-vested restricted stock at the beginning of the period (in shares) 1,415,000    
Granted (in shares) 626,000    
Vested (in shares) (640,000)    
Share-based Payment Arrangement, Expense $ 7,162 $ 8,928 $ 5,106
Forfeited (in shares) (59,000)    
Non-vested restricted stock at the end of the period (in shares) 1,342,000 1,415,000  
Weighted-average Fair Value on Grant Date      
Non-vested restricted stock at the beginning of the period (in dollars per share) $ 15.19    
Granted (in dollars per share) 21.89    
Vested (in dollars per share) 12.08    
Forfeited (in dollars per share) 18.49    
Non-vested restricted stock at the end of the period (in dollars per share) $ 19.66 $ 15.19  
Compensation not yet recognized $ 7,300 $ 8,000  
Restricted Stock Units Settled with Cash      
Shares      
Vested (in shares) (37,377)    
Share-based Payment Arrangement, Expense $ 400    
Director | RSUs      
Weighted-average Fair Value on Grant Date      
Vesting period 0 years    
Officer | RSUs      
Weighted-average Fair Value on Grant Date      
Vesting period 3 years    
Chief executive officer | RSUs      
Weighted-average Fair Value on Grant Date      
Period of restriction for sale of shares 90 days    
LTIPs      
Shares      
Share-based Payment Arrangement, Expense $ 4,922 3,938 $ 2,551
Weighted-average Fair Value on Grant Date      
Terms of award P2Y    
LTIPs | RSUs      
Weighted-average Fair Value on Grant Date      
Compensation not yet recognized $ 3,900 $ 4,100  
2020/2021 | Awards Vesting in 2020      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 0    
2020/2021 | Awards Vesting in 2021      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 63,000    
2019/2020 | Awards Vesting in 2020      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 53,000    
2019/2020 | Awards Vesting in 2021      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 50,000    
2018/2019 | Awards Vesting in 2020      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 58,000    
2018/2019 | Awards Vesting in 2021      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 55,000    
2017/2018 | Awards Vesting in 2020      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Number 156,000