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, 2022
Dec. 31, 2021
Dec. 31, 2020
Restricted shares      
Shares      
Unvested at the beginning of the period (in shares or units) 334,573 360,817 392,863
Stock awards granted (in shares or units) 186,515 177,995 166,918
Forfeited (in shares or units) (43,420) (39,664) (25,773)
Vested (in shares or units) (152,585) (164,575) (173,191)
Unvested at the end of the period (in shares or units) 325,083 334,573 360,817
Unvested shares as of December 31, 2022 that are expected to vest (in shares) 297,282    
Weighted Average Grant Date Fair Value      
Unvested at the beginning of the period (in dollars per share or unit) $ 26.22 $ 26.16 $ 27.49
Grant date fair value (in dollars per share or unit) 26.50 26.17 25.22
Forfeited (in dollars per share or unit) 26.47 26.62 27.12
Vested (in dollars per share or unit) 26.39 25.95 28.14
Unvested at the end of the period (in dollars per share or unit) 26.27 $ 26.22 $ 26.16
Unvested shares as of December 31, 2022 that are expected to vest (in dollars per share or unit) $ 26.25    
TB- PIUs      
Shares      
Unvested at the beginning of the period (in shares or units) 163,073 114,334 61,820
Stock awards granted (in shares or units) 101,966 93,983 98,318
Forfeited (in shares or units)     (20,622)
Vested (in shares or units) (77,709) (45,244) (25,182)
Unvested at the end of the period (in shares or units) 187,330 163,073 114,334
Unvested shares as of December 31, 2022 that are expected to vest (in shares) 186,345    
Weighted Average Grant Date Fair Value      
Unvested at the beginning of the period (in dollars per share or unit) $ 25.99 $ 25.57 $ 26.01
Grant date fair value (in dollars per share or unit) 26.39 26.16 25.47
Forfeited (in dollars per share or unit)     25.50
Vested (in dollars per share or unit) 26.04 25.28 26.30
Unvested at the end of the period (in dollars per share or unit) 26.19 $ 25.99 $ 25.57
Unvested shares as of December 31, 2022 that are expected to vest (in dollars per share or unit) $ 26.19