Real Estate Investments - Purchase Price Allocation (Details) - USD ($) $ in Thousands		Jun. 22, 2015	Dec. 19, 2013
Broadmoor Austin Associates [Member]
Business Acquisition [Line Items]
Building, land and improvements		$ 163,271
Land inventory		6,045
Intangible assets acquired	[1]	50,637
Below market lease liabilities assumed	[2]	(8,600)
Total purchase price		211,353
Return of existing equity method investment		(66,324)
Gain on remeasurement		(758)
Net working capital assumed		(450)
Total cash payment at settlement		$ 143,821
Commerce Square [Member]
Business Acquisition [Line Items]
Building, land and improvements			$ 255,705
Intangible assets acquired			85,036
Below market lease liabilities assumed			(8,637)
Total purchase price			332,104
Mortgage debt assumed - at fair value	[3]		(238,082)
Net working capital assumed			10,423
Non-controlling interest			(946)
Total cash payment at settlement			73,075
Return of existing equity method investment			$ (30,424)

[1] Weighted average amortization period of 4.0 years.

[2] Weighted average amortization period of 1.5 years

[3] Principal outstanding on assumed mortgage debt at December 19, 2013 was $237.1 million.