Summary of Significant Accounting Policies - Notes Receivable (Textual) (Details) - USD ($) $ in Thousands		12 Months Ended
	Jan. 30, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable		$ 0	$ 88,000
Proceeds from repayment of mortgage notes receivable		88,000	7,026	$ 200
Interest income		1,224	3,974	$ 1,044
River Place [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable			88,000
Proceeds from repayment of mortgage notes receivable	$ 88,000
Interest income		$ 400	$ 700