Annual report pursuant to Section 13 and 15(d)

Share-Based Compensation and Other Compensation Matters (Restricted Shares and TB-PIUs Activity) (Details)

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Share-Based Compensation and Other Compensation Matters (Restricted Shares and TB-PIUs Activity) (Details) - $ / shares
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Restricted shares      
Shares      
Unvested at the beginning of the period (in shares) 392,863 438,685 425,626
Stock awards granted (in shares or units) 166,918 195,520 219,716
Forfeited (in shares) (25,773) (56,341) (25,419)
Vested (in shares) (173,191) (185,001) (181,238)
Unvested at the end of the period (in shares) 360,817 392,863 438,685
Unvested shares as of December 31, 2020 that are expected to vest (in shares) 330,605    
Weighted Average Grant Date Fair Value      
Unvested at the beginning of the period (in dollars per share) $ 27.49 $ 28.38 $ 30.37
Grant date fair value (in dollars per share) 25.22 26.56 25.62
Forfeited (in dollars per share) 27.12 29.44 30.02
Vested (in dollars per share) 28.14 28.01 29.49
Unvested at the end of the period (in dollars per share) 26.16 $ 27.49 $ 28.38
Unvested shares as of December 31, 2020 that are expected to vest (in dollars per share) $ 26.14    
Restricted shares | Former Executive Vice President and Chief Operating Officer      
Shares      
Forfeited (in shares) (9,064)    
Time-based PIUs      
Shares      
Unvested at the beginning of the period (in shares) 61,820 0  
Stock awards granted (in shares or units) 98,318 61,820  
Forfeited (in shares) (20,622)    
Vested (in shares) (25,182)    
Unvested at the end of the period (in shares) 114,334 61,820 0
Unvested shares as of December 31, 2020 that are expected to vest (in shares) 114,334    
Weighted Average Grant Date Fair Value      
Unvested at the beginning of the period (in dollars per share) $ 26.01    
Grant date fair value (in dollars per share) 25.47 $ 26.01  
Forfeited (in dollars per share) 25.50    
Vested (in dollars per share) 26.30    
Unvested at the end of the period (in dollars per share) 25.57 $ 26.01  
Unvested shares as of December 31, 2020 that are expected to vest (in dollars per share) $ 25.57