Noncontrolling Interest - Common Shares and Units Activity (Details)	6 Months Ended
	Jun. 30, 2017 shares
Increase (Decrease) in Stockholders' Equity
Ownership percentage by noncontrolling owners	0.03%
Common Shares
Increase (Decrease) in Stockholders' Equity
Outstanding, beginning balance (in shares)	123,994,465
Restricted share and time-based LTIP Unit grants, net of forfeitures (in shares)	94,978
Outstanding, ending balance (in shares)	124,089,443
Common Shares and LTIP Units
Increase (Decrease) in Stockholders' Equity
Outstanding, beginning balance (in shares)	123,994,465
Restricted share and time-based LTIP Unit grants, net of forfeitures (in shares)	137,498
Outstanding, ending balance (in shares)	124,131,963
Noncontrolling Interest | LTIP Units
Increase (Decrease) in Stockholders' Equity
Outstanding, beginning balance (in shares)	0
Restricted share and time-based LTIP Unit grants, net of forfeitures (in shares)	42,520
Outstanding, ending balance (in shares)	42,520