Non-controlling Interests (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Non-controlling Interests [Abstract]
Net income attributable to common shareholders	$ 290,898	$ 37,044	$ 778,930	$ 188,722
Increase in equity for conversion of operating partnership units			217	86
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			$ 779,147	$ 179,328