Selected Quarterly Financial Data (Unaudited) (Details 2)	12 Months Ended			0 Months Ended		3 Months Ended
	Dec. 31, 2013 USD ($)	Dec. 31, 2012 USD ($)	Dec. 31, 2011 USD ($)	Sep. 06, 2013 Barchester debt investments USD ($)	Sep. 06, 2013 Barchester debt investments GBP (£)	Sep. 30, 2013 Barchester debt investments USD ($)	Sep. 30, 2013 Barchester debt investments GBP (£)
Loans receivable:
Cash payments received from borrower				$ 202,000,000	£ 129,000,000	$ 202,000,000	£ 129,000,000
Additional interest income as a result of extinguishment of loans	$ 86,159,000	$ 24,536,000	$ 99,864,000	$ 24,000,000		$ 24,000,000