Organization and Summary of Significant Accounting Policies (Details 4) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Derivative instruments
Net loss on debt extinguishment and derivatives termination	$ (15,462,000)	$ (343,000)
Interest rate contracts
Derivative instruments
Notional amount of outstanding derivative instruments	100,000,000
Interest rate contracts | Cash Flow Hedging
Derivative instruments
Notional amount of outstanding derivative instruments	100,000,000
Net fair value of swap liability	1,700,000	12,300,000
Interest expenses	(6,400,000)	(11,300,000)
Net loss on debt extinguishment and derivatives termination	$ 10,200,000