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Commitments and Contingencies (Narrative) (Details) (USD $)
 1 Months Ended 12 Months Ended
Apr. 30, 2010
instance_of_noncompliance
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2008
Commitments and Contingencies Disclosure [Abstract]          
Deferred rent   $ 2,200,000 $ 1,600,000    
Total rent expense   17,700,000 18,200,000 17,100,000  
Exposure to earthquake loss   52,200,000      
Number of instances of non-compliance issued from regulatory body 35        
Settlement of fine and penalty levied by California DOI         $ 300,000