Equity Investments (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Summarized statements of operations of SoCal
Interest, dividends and discount accretion	$ 21,123	$ 25,458	$ 17,128
Expenses
General and administrative	3,561	3,558	3,402
SoCal [Member]
Summarized statements of operations of SoCal
Interest, dividends and discount accretion	25,122	635
Expenses
Interest	7,794
General and administrative	424	269
Other expenses	12
Total expenses	8,230	269
Net income	16,892	366
Trust's share of net income	$ 9,706	$ 272