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Income Tax (Provision for Income Tax Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]          
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 51,931 $ 118,760 $ 80,895 $ 191,506  
Tax Adjustments, Settlements, and Unusual Provisions (4,314) 0 (3,539) 0  
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount (330) (4,261) 1,103 (10,413)  
Income Tax Reconciliation Foreign Income Tax Basis Differential (1,132) (13,375) (6,892) (16,759)  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 3,079 13,031 10,501 14,213  
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount (2,036) (1,783) (1,201) (1,172)  
Income Tax Reconciliation Change In Foreign Enacted Tax Rate 145 44 417 (1,193)  
Income Tax Reconciliation SubpartF (348) 1,140 310 1,326  
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount 113 (1,938) (459) (2,064)  
Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income (119) 0 4,291 0  
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount 3,135 2,609 4,250 4,464 $ 10,500
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount (503) (633) (139) (403)  
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount (437) (1,251) (428) (1,120)  
Income Tax Expense (Benefit) $ 42,914 $ 107,125 $ 80,609 $ 169,457  
Effective Income Tax Rate Reconciliation, Percent 17.40% 31.60% 20.90% 31.00%