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Income Taxes - Rate Reconciliation (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]      
Income Tax Provision at the Federal Statutory Tax Rate $ 22,032 $ 20,782 $ 16,175
Differences in Tax Rates on Foreign Earnings and Remittances (3,207) (3,692) (2,546)
Foreign Dividends 815 735 15,645
Excess Foreign Tax Credit Utilization (2,237) (2,493) (15,198)
Research and Development Activities Credit Utilization 0 (1,348) 0
Uncertain Tax Positions (1,196) 701 (1,130)
Domestic Production Activities Deduction (402) 0 (932)
State Income Tax Provisions, Net (45) 250 127
Non-deductible Entertainment and Business Meals Expense 200 166 152
Non-taxable Gain on Acquisition 0 (951) 0
Miscellaneous Items, Net (385) 106 323
Income Tax Expense (Benefit), Total $ 15,575 $ 14,256 $ 12,616