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Income Taxes - Narrative (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Income Tax Disclosure [Abstract]    
Effective income tax rate 19.60% 65.00%
U.S. Federal statutory rate 35.00% 35.00%
Previously unrecognized tax benefits   $ 1.1
Deferred tax assets 25.7  
Unrecognized deductions for share based compensation awards $ 13 $ 15