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Income Taxes - Narrative (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
State
Dec. 31, 2012
Internal Revenue Service (IRS)
Jun. 30, 2013
Internal Revenue Service (IRS)
Operating Loss Carryforwards [Line Items]          
Effective income tax rate 42.80% 34.00%      
Federal statutory tax rate 35.00% 35.00%      
Net operating loss carryforward     $ 2.4   $ 4.8
Cash benefits received from operating loss carrybacks       $ 13.1