Subsequent Events (Details) (USD $)	1 Months Ended	3 Months Ended				1 Months Ended	0 Months Ended					0 Months Ended
	Sep. 30, 2010	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2014 New York Recovery Advisors, LLC Advisor Average Invested Assets	Mar. 30, 2012 Credit facility	Apr. 30, 2014 Subsequent Event	May 05, 2014 Subsequent Event Operating Partnership Unit	Apr. 14, 2014 Subsequent Event Operating Partnership Unit	Apr. 15, 2014 Subsequent Event New York Recovery Advisors, LLC Advisor Average Invested Assets	Apr. 14, 2014 Subsequent Event Credit facility Operating Partnership Unit	Apr. 14, 2014 Subsequent Event Line of Credit Operating Partnership Unit	May 12, 2014 Tender Offer Subsequent Event	Apr. 15, 2014 Tender Offer Subsequent Event	Apr. 15, 2014 Class B units Subsequent Event New York Recovery Advisors, LLC
Subsequent Event [Line Items]
Authorized repurchase amount (in shares)													23,255,814
Average Price per Share (in dollars per share)												$ 10.75	$ 10.75
Shares retired (in shares)												12,903,858
Repurchases of common stock		$ 506,000	$ 426,000									$ 138,700,000
Dividends declared (in dollars per share)	$ 0.605	$ 0.605				$ 0.46
Asset management fees as a percentage of benchmark				0.75%					0.50%
Maximum capacity on credit facility					40,000,000.0			705,000,000		400,000,000	305,000,000
Additional borrowing capacity, under certain circumstances								1,000,000,000
Maximum for fee determination									3,000,000,000
Asset maximum for fee determination percentage									0.40%
Limited partners expected contributed capital														800,000
LLC or limited partnership members or limited partners ownership interest														83,333
Proceeds from line of credit							$ 68,000,000