Related Party Transactions (Details)									12 Months Ended
	Oct. 02, 2014 $ / shares shares	Sep. 26, 2014 $ / shares shares	Jul. 03, 2014 USD ($)	Feb. 11, 2014 $ / shares shares	Jan. 10, 2014 $ / shares shares	Jul. 03, 2013 USD ($)	Jun. 05, 2012 USD ($) director $ / shares shares	May. 18, 2011 USD ($)	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($) shares	Dec. 31, 2013 USD ($) shares	Dec. 08, 2014 USD ($)
Related Party Transaction [Line Items]
Issuance of common stock (in shares) | shares										23,716,900	31,049,976
Murano Retail Unit
Related Party Transaction [Line Items]
Net Sales Price												$ 3,500,000
Office Building | Millenia Park One
Related Party Transaction [Line Items]
Total purchase price						$ 25,500,000
Management Services Agreement | Transaction Fee
Related Party Transaction [Line Items]
Related party transactions amount							$ 6,000,000
Management Services Agreement | Expense Reimbursement
Related Party Transaction [Line Items]
Related party transactions amount							1,000,000
Management Services Agreement | Monitoring Fee
Related Party Transaction [Line Items]
Related party transactions amount							$ 600,000		$ 1,000,000
Number of directors TPG Pantera has the right to appoint | director							4
Stockholders Agreement
Related Party Transaction [Line Items]
Minimum ownership interest which allows TPG Pantera to nominate directors (more than)							5.00%
Minimum ownership interest which allows TPG Pantera to exercise significant influence (greater than)							20.00%
Management Company
Related Party Transaction [Line Items]
Management fees									398,000	$ 3,500,000	$ 4,000,000
Reimbursements related to management and leasing of assets									869,000	8,800,000	10,200,000
Corporate Joint Venture
Related Party Transaction [Line Items]
Management fees									384,000	4,200,000	0
Investor | TPG Pantera | Purchase Agreement
Related Party Transaction [Line Items]
Aggregate investment in securities							$ 200,000,000
Officer | Office Building | Millenia Park One
Related Party Transaction [Line Items]
Total purchase price			$ 25,500,000
Common Stock
Related Party Transaction [Line Items]
Issuance of common stock (in shares) | shares	1,500,000	10,000,000		1,325,000	10,500,000
Share price (in dollars per share) | $ / shares	$ 18.60	$ 18.60		$ 18.15	$ 18.15
Common Stock | Investor | TPG Pantera | Purchase Agreement
Related Party Transaction [Line Items]
Issuance of common stock (in shares) | shares							4,300,000
Share price (in dollars per share) | $ / shares							$ 11.25
Series E Preferred Stock | Investor | TPG Pantera | Purchase Agreement
Related Party Transaction [Line Items]
Issuance of common stock (in shares) | shares							13,477,778
Preferred stock par value (in dollars per share) | $ / shares							$ 0.001
Preferred stock, liquidation value (in dollars per share) | $ / shares							$ 11.25
Equity Securities
Related Party Transaction [Line Items]
Percentage of income from preferred equity investment								7.00%
Dividend income from preferred equity investment									$ 245,000	$ 265,000	$ 225,000
Subsidiaries | Equity Securities
Related Party Transaction [Line Items]
Payments to acquire preferred equity securities								$ 3,500,000
Mr. Heistand
Related Party Transaction [Line Items]
Percentage of equity interest								21.00%