Quarterly report pursuant to Section 13 or 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 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Shareholders' Equity [Abstract]          
Distributions paid to common shareholders $ 28,800 $ 28,700 $ 86,343 $ 75,107  
Dividends paid per common share $ 1.05 $ 1.05 $ 3.15 $ 2.75  
Distributions paid to noncontrolling interests — common units $ 7,700 $ 7,700 $ 23,012 $ 20,090  
Dividends paid per common unit $ 1.05 $ 1.05 $ 3.15 $ 2.75  
Equity stock, shares authorized 100,000,000.0   100,000,000.0    
Equity stock, shares issued 0   0   0