Debt Unsecured Loan and Notes Payable (Details) (USD $)					12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013 Unsecured Debt [Member] Sponsors [Member]	Dec. 31, 2013 Notes Payable, Other Payables [Member] Sponsors [Member]	Apr. 30, 2013 Notes Payable, Other Payables [Member] Sponsors [Member]	Dec. 31, 2013 Notes Payable, Other Payables [Member] Sponsors [Member] LIBOR [Member]	Apr. 21, 2011 Notes Payable, Other Payables [Member] 500 Mamaroneck Avenue [Member] Investor [Member]	Apr. 21, 2011 Notes Payable, Other Payables [Member] 500 Mamaroneck Avenue [Member] Sponsors [Member]
Debt Instrument [Line Items]
Unsecured loan and notes payable—related parties	$ 0	$ 14,700,000	$ 3,800,000
Stated Rate		1.20%					10.00%
Face amount				$ 4,500,000.0		$ 3,600,000.0	$ 1,200,000.0
Basis spread on variable rate					2.50%
Interest rate at end of period			2.67%