Schedule IV (Consolidated) - Mortgage Loans on Real Estate - Carrying Amount of Mortgage Loans (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Movement in Mortgage Loans on Real Estate [Roll Forward]
Balance at beginning of the year	$ 5,354	$ 1,158	$ 1,752
Additions during the year - new mortgage loans	19,600	5,854	0
Collections of principal	2,832	1,363	594
Foreclosures	0	295	0
Balance at the end of the year	$ 22,122	$ 5,354	$ 1,158