Equity - Dividends and Distributions (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Equity [Abstract]
Dividends paid to common shareholders	$ 16,600	$ 13,000	$ 33,100	$ 23,300
Distributions paid to OP unitholders	14,900	15,400	29,800	28,000
Private perpetual preferred unit distributions	$ 200	$ 200	$ 468	$ 468