Annual report pursuant to Section 13 and 15(d)

Shareholders' Equity (Common Stock And Units And Equity Stock) (Narrative) (Details)

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Shareholders' Equity (Common Stock And Units And Equity Stock) (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shareholders' Equity [Line Items]          
Distributions paid to common shareholders     $ 115,396 $ 115,154 $ 103,837
Dividends paid per common share $ 1.05 $ 0.85 $ 4.20 $ 4.20 $ 3.80
Distributions paid to noncontrolling interests — common units     $ 30,683 $ 30,683 $ 27,760
Percentage of distributions classified as ordinary income     100.00% 100.00% 99.30%
Percentage of distributions classified as long-term capital gain income     0.00% 0.00% 0.70%
Equity stock, shares authorized     100,000,000.0    
Equity stock, shares issued     0 0  
Common Units [Member]          
Shareholders' Equity [Line Items]          
Dividends paid per common unit     $ 4.20 $ 4.20 $ 3.80