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Income Tax (Provision for Income Tax Expense) (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Income Tax Disclosure [Abstract]      
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount $ 28,964 $ 72,745  
Tax Adjustments, Settlements, and Unusual Provisions 775 0  
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount 1,432 (6,153)  
Income Tax Reconciliation Foreign Income Tax Basis Differential (5,760) (3,383)  
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount 7,947 1,182  
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount 835 611  
Income Tax Reconciliation Change In Foreign Enacted Tax Rate 111 (1,237)  
Income Tax Reconciliation SubpartF 658 186  
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount (572) (126)  
Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income 4,409 0  
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount 0 229  
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount (1,114) (1,856) $ 10,500
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount 10 134  
Income Tax Expense (Benefit) $ 37,695 $ 62,332  
Effective Income Tax Rate Reconciliation, Percent 27.30% 30.00%