Fair Value of Financial Instruments (Fair Value, by Balance Sheet Grouping) (Details) - Level 3 - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Mortgage notes payable | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	$ 369,395	$ 388,436
Mortgage notes payable | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	382,225	401,503
Credit Facility | Carrying Amount
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	485,000	485,000
Credit Facility | Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Debt, fair value	$ 487,249	$ 487,579