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Quarterly Financial Data (unaudited) (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
$ / shares
Jun. 30, 2017
USD ($)
$ / shares
Mar. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
$ / shares
Mar. 31, 2016
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Hurricane related expenses per diluted share | $ / shares   $ 0.05                  
Hurricane related expenses | $   $ 4,987                  
Hurricane Related Expenses per basic share | $ / shares   $ 0.05                  
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property | $                 $ 43,231 $ 295,397 $ 104,288
Revenues | $ $ 229,827 $ 228,178 $ 223,370 $ 219,521 $ 217,139 $ 220,235 $ 221,478 $ 217,595 900,896 876,447 835,618
Net income attributable to common shareholders | $ $ 87,989 $ 34,384 $ 39,188 $ 34,861 $ 40,893 $ 290,898 $ 446,302 $ 41,730 $ 196,422 $ 819,823 $ 249,315
Total earnings per common share - basic | $ / shares $ 0.92 [1] $ 0.38 [2] $ 0.43 [3] $ 0.39 $ 0.45 $ 3.23 [4] $ 4.94 [3] $ 0.46 $ 2.14 [5] $ 9.08 [5] $ 2.77
Total earnings per common share - diluted | $ / shares 0.91 [1] $ 0.38 [2] $ 0.43 [3] $ 0.39 $ 0.45 $ 3.21 [4] $ 4.92 [3] $ 0.46 $ 2.13 [5] $ 9.05 [5] $ 2.76
Gain (Loss) on Sale of Properties | $           $ 262,719 $ 32,235        
Income loss due to disposition of operating properties per basic share | $ / shares 0.46         $ 2.93 $ 0.36        
Income loss due to disposition of operating properties per diluted share | $ / shares $ 0.45         $ 2.92 $ 0.36        
Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]                      
Gain (Loss) on Sale of Properties | $                   $ 294,900 $ 104,000
Number of operating properties sold 1       6 5 1   1 6 3
Dual-Phase Property Sale [Member] | Disposal Group, Disposed of by Sale, Not Discontinued Operations [Member]                      
Number of operating properties sold         1 1       1  
[1] Includes a $43,231, or $0.46 basic and $0.45 diluted per share, impact related to a gain on sale of one operating property.
[2] Includes a $4,987, or $0.05 basic and diluted per share, impact related to expenses due to Hurricanes Harvey and Irma.
[3] Includes a $32,235, or $0.36 basic and diluted per share, impact related to a gain on sale of one operating property.
[4] Includes a $262,719, or $2.93 basic and $2.92 diluted per share, impact related to a gain on sale of one dual-phased operating property and five other operating properties.
[5] Net income per share is computed independently for each of the quarters presented. Therefore, the sum of quarterly net income per share amounts may not equal the total computed for the year.