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
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Income Taxes      
Provision for income taxes, as a percentage of income before income taxes 33.10% 20.30%  
Statutory U.S. federal income tax rate (as a percent) 35.00% 35.00%  
Foreign exchange gains (losses) (as a percent) (9.70%)    
Uncertain tax positions increase (decrease) in tax liabilities (as a percent) 7.70% (9.50%)  
Tax adjustment for inflation (as a percent)   (4.40%)  
Foreign tax credits (as a percent)   (4.70%)  
Accrued amount related to uncertain tax positions $ 10,609   $ 10,571