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Income Tax (Details) (USD $)
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract]        
Income Tax Reconciliation, Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate $ 70,517,000 $ 54,739,000 $ 209,347,000 $ 199,612,000
Income Tax Reconciliation, Foreign Income Tax Rate Differential (3,174,000) (4,382,000) (10,063,000) (9,583,000)
Income Tax Reconciliation Foreign Income Tax Basis Differential (5,073,000) (1,604,000) (7,991,000) (4,550,000)
Income Tax Reconciliation Subpart F 943,000 0 6,015,000 0
Income Tax Reconciliation, Nondeductible Expense, Meals and Entertainment 111,000 147,000 350,000 396,000
Income Tax Reconciliation, Change in Deferred Tax Assets Valuation Allowance 105,000 0 250,000 795,000
Income Tax Reconciliation, Tax Contingencies, Domestic (747,000) 984,000 1,276,000 4,499,000
Income Tax Reconciliation, Nondeductible Expense, Life Insurance (164,000) 756,000 (907,000) 173,000
Income Tax Reconciliation Change In Foreign Enacted Tax Rate 330,000 (30,687,000) (1,319,000) (30,687,000)
Income Tax Reconciliation, Prior Year Income Taxes (4,869,000) 1,778,000 (6,013,000) 1,784,000
Income Tax Reconciliation, Other Adjustments (975,000) 63,000 (1,715,000) 415,000
Provision for income taxes $ 57,004,000 $ 21,794,000 $ 189,230,000 $ 162,854,000
Effective Income Tax Rate, Continuing Operations 28.30% 13.90% 31.60% 28.60%