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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2017
Dec. 31, 2017
Jun. 30, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2014
Income Tax Examination [Line Items]              
Provision (benefit) for income taxes       $ 48,920 $ (10,781) $ (7,552)  
U.S. federal income tax rate     35.00% 35.00%     35.00%
Net non-current deferred tax assets   $ 30,768   $ 71,707 30,768    
Net non-current deferred tax liabilities   41,746   45,825 41,746    
Proceeds from Issuance of Long-term Debt           53,000  
Total foreign tax credit carryforwards   175,229   111,325 175,229    
Deferred Tax Assets, Operating Loss Carryforwards       59,300      
Deferred Tax Assets, Non-Operating Loss Carryforwards       3,000      
Operating Loss Carryforwards, Valuation Allowance       35,800      
Tax Credit Carryforward, Amount       10,100      
Unrecognized tax benefits   2,492   1,990 2,492 3,338  
Expired Foreign Tax Credits $ 19,500            
Increase in Foreign Tax Credit Carryforward   37,700          
Unrecognized Tax Benefits that Would Impact Effective Tax Rate       2,000      
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued   800   900 800 800  
Unrecognized Tax Benefits, Increase (Decrease) Income Tax Penalties and Interest Accrued       100 0 0  
Decrease in Unrecognized Tax Benefits is Reasonably Possible       2,000      
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations       373      
Deferred Tax Assets, Net of Valuation Allowance   67,470   99,961 67,470 $ 6,500  
Deferred Tax Assets, Capital Loss Carryforwards   $ 2,603   0 $ 2,603    
Undistributed Earnings of Foreign Subsidiaries       1,600,000      
Undistributed Earnings of Foreign Subsidiaries Subjected to One Time Transition Fee       998,300      
Domestic Tax Authority [Member]              
Income Tax Examination [Line Items]              
Tax Credit Carryforward, Amount       25,200      
State and Local Jurisdiction [Member]              
Income Tax Examination [Line Items]              
Tax Credit Carryforward, Amount       $ 320,300