Annual report pursuant to Section 13 and 15(d)

Equity - Unvested Restricted Common Stock (Details)

v3.22.4
Equity - Unvested Restricted Common Stock (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Restricted Incentive    
Shares    
Beginning Balance (in shares) 193,548 367,177
Granted (in shares) 71,911 80,886
Vested (in shares) (93,646) (250,758)
Forfeited (in shares) (3,361) (3,757)
Ending Balance (in shares) 168,452 193,548
Weighted Average Grant Date Fair Value    
Beginning Balance (in usd per share) $ 38.66 $ 27.77
Granted (in usd per share) 37.32 59.41
Vested (in usd per share) 46.46 29.22
Forfeited (in usd per share) 46.83 51.43
Ending Balance (in usd per share) $ 33.59 $ 38.66
Value    
Beginning Balance $ 7.5 $ 10.2
Granted 2.7 4.8
Vested (4.3) (7.3)
Forfeited (0.2) (0.2)
Ending Balance $ 5.7 $ 7.5
Restricted Stock Units    
Shares    
Beginning Balance (in shares) 78,366 235,600
Granted (in shares) 24,790 17,426
Vested (in shares) (79,460) (342,360)
Forfeited (in shares) (5,022) (3,480)
Ending Balance (in shares) 58,404 78,366
Weighted Average Grant Date Fair Value    
Beginning Balance (in usd per share) $ 35.32 $ 21.78
Granted (in usd per share) 58.77 71.23
Vested (in usd per share) 25.12 20.24
Forfeited (in usd per share) 49.00 39.92
Ending Balance (in usd per share) $ 51.03 $ 35.32
Value    
Beginning Balance $ 2.8 $ 5.1
Granted 1.5 1.2
Vested (2.1) (6.9)
Forfeited (0.2) (0.1)
Ending Balance $ 3.0 $ 2.8
Restricted Stock Units | Minimum    
Value    
Award vesting percentage 0.00%  
Restricted Stock Units | Maximum    
Value    
Award vesting percentage 200.00%  
Incremental performance shares granted    
Shares    
Granted (in shares) 39,730 171,180
Weighted Average Grant Date Fair Value    
Granted (in usd per share) $ 25.12 $ 20.24
Value    
Granted $ 1.0 $ 3.5
LTIP Time-Based Vesting Units    
Shares    
Beginning Balance (in shares) 384,046 285,682
Granted (in shares) 174,340 249,573
Vested (in shares) (279,123) (151,209)
Forfeited (in shares) (2,497) 0
Ending Balance (in shares) 276,766 384,046
Weighted Average Grant Date Fair Value    
Beginning Balance (in usd per share) $ 43.15 $ 21.62
Granted (in usd per share) 44.08 54.73
Vested (in usd per share) 44.64 21.58
Forfeited (in usd per share) 46.08 0
Ending Balance (in usd per share) $ 42.21 $ 43.15
Value    
Beginning Balance $ 16.6 $ 6.2
Granted 7.7 13.7
Vested (12.5) (3.3)
Forfeited (0.1) 0.0
Ending Balance $ 11.7 $ 16.6
LTIP Market-Based Vesting Units    
Shares    
Beginning Balance (in shares) 347,478 312,704
Granted (in shares) 125,550 86,274
Vested (in shares) (298,000) (103,000)
Forfeited (in shares) 0 0
Ending Balance (in shares) 324,028 347,478
Weighted Average Grant Date Fair Value    
Beginning Balance (in usd per share) $ 31.61 $ 20.59
Granted (in usd per share) 54.77 65.28
Vested (in usd per share) 26.70 21.09
Forfeited (in usd per share) 0 0
Ending Balance (in usd per share) $ 42.84 $ 31.61
Value    
Beginning Balance $ 11.0 $ 6.4
Granted 6.9 5.6
Vested (8.0) (2.1)
Forfeited 0.0 0.0
Ending Balance $ 13.9 $ 11.0
LTIP Market-Based Vesting Units | Minimum    
Value    
Award vesting percentage 0.00%  
LTIP Market-Based Vesting Units | Maximum    
Value    
Award vesting percentage 200.00%  
Incremental performance shares granted    
Shares    
Granted (in shares) 149,000 51,500
Weighted Average Grant Date Fair Value    
Granted (in usd per share) $ 26.70 $ 21.09
Value    
Granted $ 4.0 $ 1.1
Award vesting percentage 200.00%