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Real Estate Investments - Acquistions (Details) $ / shares in Units, $ in Thousands				3 Months Ended								12 Months Ended
	Oct. 02, 2014 USD ($) ft²	May. 02, 2014 USD ($) ft²	Mar. 26, 2014 USD ($) ft²	Dec. 31, 2015 USD ($) apartment	Sep. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Mar. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) unit	Sep. 30, 2014 USD ($)	Jun. 30, 2014 USD ($)	Mar. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) apartment $ / shares	Dec. 31, 2014 USD ($) ft² note unit $ / shares	Dec. 31, 2013 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2015 unit	Jul. 01, 2015 USD ($) unit	Feb. 21, 2014 USD ($) unit	Oct. 02, 2013 USD ($) unit
Business Acquisition [Line Items]
Loans Payable								$ 414,500					$ 414,500		$ 414,546
Units				506								506				3,258
Mortgage notes payable, net								417,194					417,194		418,052
Real estate impairment						$ 5,900						$ 5,909	0	$ 0
Contract Purchase Price								2,470,953					2,470,953		2,637,797
Real estate rental revenue				$ 79,102	$ 78,243	74,226	$ 74,856	74,359	$ 73,413	$ 72,254	$ 68,611	306,427	288,637	263,024
Net loss				$ 62,095	$ 580	$ (2,886)	$ 29,398	2,309	$ 3,658	$ 1,080	$ 104,554	89,187	111,601	37,346
Land												30,548	104,403	8,568
Land Available for Development												15,000	0	0
Buildings												116,563	172,671	37,930
Tenant origination costs								9,377					9,377	32	0
Leasing commissions/absorption costs								16,474					16,474	943	4,889
Net lease intangible assets								7,331					7,331	102	0
Net lease intangible liabilities								(8,323)					(8,323)	(117)	0
Fair value of assumed mortgage								(107,125)					(107,125)	0	0
Furniture, fixtures & equipment								932					932	742	0
Payments to Acquire Real Estate												151,682	$ 194,536	48,200
Number of Mortgage Notes Assumed | note													2
Notes Assumed													$ 100,900
Business Acquisition, Pro Forma Revenue												313,114	302,120
Business Acquisition, Pro Forma Income (Loss) from Continuing Operations before Changes in Accounting and Extraordinary Items, Net of Tax												96,735	4,466
Business Acquisition, Pro Forma Net Income (Loss)												$ 96,735	$ 110,997
Business Acquisition, Pro Forma Earnings Per Share, Diluted | $ / shares												$ 1.41	$ 1.66
Wellington [Member]
Business Acquisition [Line Items]
Units | unit																	711
Yale West [Member]
Business Acquisition [Line Items]
Loans Payable								47,903					$ 47,903		47,502
Units | unit																216		216
Mortgage notes payable, net															51,900
The Army Navy Club Building [Member]
Business Acquisition [Line Items]
Loans Payable								$ 51,844					$ 51,844		50,750
Mortgage notes payable, net															51,000
The Paramount [Member]
Business Acquisition [Line Items]
Units | unit																135			135
Property Acquired [Member]
Business Acquisition [Line Items]
Units | unit								216					216
Rentable Square Feet | ft²													368,000
Contract Purchase Price								$ 297,000					$ 297,000
Real estate rental revenue												$ 6,797	16,260	907
Net loss												(2,748)	(3,168)	(105)
Real Estate Investment Property, at Cost, Including Note Payable Assumed								297,000					297,000
Real Estate Investment Property, at Cost, Net of Adjustments								$ 195,740					195,740	48,200	$ 167,000
Property Acquired [Member] | Wellington [Member]
Business Acquisition [Line Items]
Contract Purchase Price																	$ 167,000
Payments to Acquire Real Estate												166,700
Other Payments to Acquire Businesses												$ 300
Property Acquired [Member] | Yale West [Member]
Business Acquisition [Line Items]
Contract Purchase Price																		$ 73,000
Other Payments to Acquire Businesses														$ 3,600
Property Acquired [Member] | The Army Navy Club Building [Member]
Business Acquisition [Line Items]
Rentable Square Feet | ft²			108,000
Contract Purchase Price			$ 79,000
Property Acquired [Member] | 1775 Eye Street [Member]
Business Acquisition [Line Items]
Rentable Square Feet | ft²		185,000
Contract Purchase Price		$ 104,500
Other Payments to Acquire Businesses													$ 1,900
Property Acquired [Member] | Spring Vally Retail Center [Member]
Business Acquisition [Line Items]
Rentable Square Feet | ft²	75,000
Contract Purchase Price	$ 40,500
Property Acquired [Member] | The Paramount [Member]
Business Acquisition [Line Items]
Contract Purchase Price																			$ 48,200

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