Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Income Taxes (Reconciliation Of Statutory Income Tax Expense/(Benefit)) (Details)

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Income Taxes (Reconciliation Of Statutory Income Tax Expense/(Benefit)) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Abstract]      
Income tax expense at statutory income tax rate $ 341,425 $ 229,224 $ 77,698
Non-deductible expenditures (permanent differences) 59,234 24,426 (128)
Foreign rate differential [1] (210,854) (116,277) (51,544)
Differences between statutory and actual income tax expense (151,620) (91,851) (51,672)
Provision for income taxes 189,805 $ 137,373 $ 26,026
Release of valuation allowance $ 25,000    
[1] The tax variance as a result of global activities is primarily caused by our operations in countries with a lower statutory tax rate than the statutory tax rate in the Netherlands.