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Non-controlling Interests (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Non-controlling Interest [Line Items]                      
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
Increase in equity for conversion of operating partnership units                 117 290 86
Decrease in additional paid-in capital for purchase of remaining non-controlling ownership interests in two consolidated joint ventures                 0 0 (9,480)
Change in common equity and net transfers from non-controlling interests                 $ 196,539 $ 820,113 $ 239,921