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Income Taxes
6 Months Ended
Jun. 30, 2014
Income Tax Disclosure [Abstract]  
Income Taxes
Income Taxes
The effective tax rate was 41.1% and 40.9% for the three and six months ended June 30, 2014, compared to 38.3% and 39.9% in the same periods of 2013. The change in rate is mainly due to the impact of foreign taxes and the effect of certain acquisition-related costs which are not deductible for tax purposes. The liability for unrecognized tax benefits was $5.0 million at June 30, 2014, and $4.6 million at December 31, 2013. Included in the liability at June 30, 2014 were $3.7 million of tax positions for which ultimate deductibility is highly certain but for which there is uncertainty about the timing of such deductibility.