Fair Value Measurements - Summary of Carrying Amounts and Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Total Assets	$ 357,069	$ 343,546
Total liabilities	160,473	194,196
Carrying Amount [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash equivalents	289,917	401,215
Total Assets	289,917	401,215
Mortgage and notes payable	2,853,237	2,852,287
Total liabilities	2,853,237	2,852,287
Fair Value [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Cash equivalents	289,917	401,215
Total Assets	289,917	401,215
Mortgage and notes payable	2,797,650	2,796,842
Total liabilities	$ 2,797,650	$ 2,796,842