Summary of Significant Accounting Policies (Computation of Anti-Dilutive Common Share) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable	$ 2,627	$ 2,094	$ 0
Weighted Average Limited Partnership Units Outstanding, Basic	4,308	4,392	0
Anti-Dilutive [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable	$ 0	$ 0	$ (2,273)
Weighted Average Limited Partnership Units Outstanding, Basic	0	0	4,829
Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	1,210	1,373	1,859
Participating Securities [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities	3,844	3,871	4,099