Equity and Accumulated Other Comprehensive Loss, Net (Noncontrolling Interests in Operating Partnership) (Details) $ in Millions	Dec. 31, 2016 USD ($) shares	Dec. 31, 2015 USD ($) shares
Class of Stock [Line Items]
Partners' capital account units (in units)	159,019,118	146,384,247
Percentage of total	98.50%	98.10%
Common stock conversion ratio	1
Redemption value of OP units | $	$ 226.3	$ 192.7
Common units held by third parties
Class of Stock [Line Items]
Common units held by third parties (in units)	1,141,814	1,421,314
Percentage of total	0.70%	1.00%
Incentive units held by employees and directors (see note 13)
Class of Stock [Line Items]
Incentive units held by employees and directors (in units)	1,333,849	1,412,012
Percentage of total	0.80%	0.90%
Noncontrolling Interests in Operating Partnership
Class of Stock [Line Items]
Partners' capital account units (in units)	161,494,781	149,217,573
Percentage of total	100.00%	100.00%