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Equity Incentive Plan - Restricted Stock (Details) - $ / shares
1 Months Ended 6 Months Ended 12 Months Ended
Aug. 31, 2020
Dec. 31, 2020
Jun. 30, 2020
Restricted Stock      
Shares      
Nonvested at the beginning of the period (in shares)   1,618,604  
Granted (in shares)   402,723  
Vested (in shares)   (373,827)  
Forfeited or canceled (in shares)   (11,450)  
Nonvested at the end of the period (in shares)   1,636,050 1,618,604
Weighted-Average Grant Date Fair Value      
Nonvested at the beginning of the period (in dollars per share)   $ 23.73  
Granted (in dollars per share)   43.41  
Vested (in dollars per share)   20.41  
Forfeited or canceled (in dollars per share)   24.44  
Nonvested at the end of the period (in dollars per share)   $ 29.33 $ 23.73
Vesting period   3 years  
Restricted Stock | Vesting Based On Performance And Service      
Shares      
Granted (in shares)   96,053  
Vested (in shares)   (110,594)  
Nonvested at the end of the period (in shares)   544,247  
Performance Share Units      
Shares      
Nonvested at the beginning of the period (in shares)   2,464,853  
Granted (in shares)   477,700  
Forfeited or canceled (in shares)   (20,045)  
Nonvested at the end of the period (in shares)   2,922,508 2,464,853
Weighted-Average Grant Date Fair Value      
Nonvested at the beginning of the period (in dollars per share)   $ 10.78  
Granted (in dollars per share)   40.17 $ 12.56
Forfeited or canceled (in dollars per share)   29.93  
Nonvested at the end of the period (in dollars per share)   $ 15.45 $ 10.78
Performance Share Units | Executive Officers | Vesting Based On Performance And Service      
Weighted-Average Grant Date Fair Value      
Certified achievement percentage 109.00%    
Number of shares earned upon reaching performance threshold 13,343    
Performance Share Units | Executive Officers | Vesting Performance      
Shares      
Granted (in shares)   82,710 141,524
Weighted-Average Grant Date Fair Value      
Granted (in dollars per share)   $ 45.33 $ 27.91
Performance Share Units | Executive Officers | Vest immediately upon achievement of the performance goals      
Weighted-Average Grant Date Fair Value      
Earned award vesting percentage 33.33% 33.33%  
Performance Share Units | Executive Officers | Vest annually over two years      
Weighted-Average Grant Date Fair Value      
Earned award vesting percentage 66.67% 66.67%  
Vesting period 2 years 2 years  
Deferred Stock Units      
Shares      
Nonvested at the beginning of the period (in shares)   42,102  
Nonvested at the end of the period (in shares)   42,102 42,102
Weighted-Average Grant Date Fair Value      
Nonvested at the beginning of the period (in dollars per share)   $ 22.42  
Nonvested at the end of the period (in dollars per share)   $ 22.42 $ 22.42