Quarterly report pursuant to Section 13 or 15(d)

Income Taxes (Details)

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Income Taxes (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Income Taxes          
Provision for income taxes, as a percentage of income before income taxes 34.90% 30.50% 34.10% 25.70%  
Statutory U.S. federal income tax rate (as a percent) 35.00% 35.00% 35.00% 35.00%  
Uncertain tax positions (as a percent) 0.60%   5.30%    
Utilization of foreign tax credits (as a percent)   (3.40%)   (6.40%)  
Addition to net favorable foreign items (as a percent) (0.60%) (2.20%) (5.60%) (4.10%)  
Accrued amount related to unrecognized tax positions $ 10,797   $ 10,797   $ 10,571