Commitments And Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Commitments And Contingencies [Abstract]
Deferred rent	$ 1,642,000	$ 1,159,000
Total rent expense	18,207,000	17,076,000	17,529,000
Exposure to earthquake loss	$ 55,800,000
Settlement of fine and penalty levied by California DOI				300,000