Fair Value of Financial Instruments (Fair Value, by Balance Sheet Grouping) (Details) - Level 3 - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Mortgage notes payable | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	$ 388,436	$ 172,242
Mortgage notes payable | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	401,503	174,468
Credit Facility | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	485,000	635,000
Credit Facility | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	487,579	651,579
Preferred equity investment | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	0	35,100
Preferred equity investment | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	$ 0	$ 34,800