Schedule IV-Mortgage Loans on Real Estate (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of year	$ 70,000	$ 89,560	$ 0
Additions		30,000	90,000
Repayments		(49,560)	(440)
Conversion to equity	(30,000)
Balance at close of year	$ 40,000	$ 70,000	$ 89,560