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Income Taxes (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Income Taxes (Textual)    
Liability for uncertain tax positions, current $ 0.9  
Unrecognized tax benefits 2.6  
Unrecognized tax benefits that affects company's effective tax rate 0.4  
Tax expense (benefits) related to interest and penalties 0.1 $ 0.1
Reduction of unrecognized tax benefits in the next twelve months, due to expiration of applicable statues of limitation $ 0.3