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Income Tax (Provision for Income Tax Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]    
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 72,745 $ 37,653
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount (6,153) (3,884)
Income Tax Reconciliation Foreign Income Tax Basis Differential (3,383) (8,935)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 1,182 4,999
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount 611 602
Income Tax Reconciliation Change In Foreign Enacted Tax Rate (1,237) (65)
Income Tax Reconciliation SubpartF 186 696
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount (126) (293)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount 229 125
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount (1,856) 0
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount 134 210
Income Tax Expense (Benefit) $ 62,332 $ 31,108
Effective Income Tax Rate Reconciliation, Percent 30.00% 28.90%