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Income Tax (Provision for Income Tax Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Income Tax Disclosure [Abstract]    
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 37,653 $ 64,444
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount (3,884) (5,517)
Income Tax Reconciliation Foreign Income Tax Basis Differential (8,935) (6,670)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 4,999 6,791
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount 602 952
Income Tax Reconciliation Change In Foreign Enacted Tax Rate (65) 272
Income Tax Reconciliation SubpartF 696 6,434
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount (293) (2,343)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount 125 (4,765)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount 210 (587)
Income Tax Expense (Benefit) $ 31,108 $ 59,011
Effective Income Tax Rate Reconciliation, Percent 28.90% 32.00%