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Taxes (Details 3) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]      
Income Tax Expense (Benefit), at Federal Statutory Income Tax Rate $ 176,467 $ 162,198 $ 155,751
State and Local Income Taxes 3,064 2,551 1,899
Change in Deferred Tax Assets Valuation Allowance 0 (1,098) (172)
Foreign Income Tax Rate Differential (65,917) (54,798) (51,360)
Other Adjustments 6,209 1,751 645
Provision for taxes $ 119,823 $ 110,604 $ 106,763
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent 35.00% 35.00% 35.00%