Non-controlling Interests (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Non-controlling Interests [Abstract]
Net income attributable to common shareholders	$ 446,302	$ 36,079	$ 488,032	$ 151,678
Increase in equity for conversion of operating partnership units			255	16
Decrease in additional paid-in capital for purchase of remaining non-controlling ownership interests in two consolidated joint ventures			0	(9,480)
Change in common equity and net transfers from non-controlling interests			$ 488,287	$ 142,214