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Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
9 Months Ended 12 Months Ended 0 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2013
Dec. 31, 2012
Oct. 24, 2013
Federal
Dec. 31, 2012
Federal
Dec. 31, 2012
State
Sep. 30, 2013
State of California
State
Sep. 30, 2013
State of California
State
Income taxes              
Tax credits           $ 4.4  
Tax credit carry-forward period             10 years
Estimated carried-forward portion of tax credits           2.3 2.3
Unrecognized tax benefits           0.6 0.6
Net operating loss resulting from repairs and maintenance deductions       38.8 58.4    
Estimated repairs and maintenance deductions 5.0            
Additional first year bonus depreciation (as a percent) 50.00%            
Valuation allowance   0          
Federal income tax bonus deduction 10.0 14.5          
Amount of changes to previously reported taxes     $ 0