Income Tax (Provision for Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 45,478	$ 28,964
Tax Adjustments, Settlements, and Unusual Provisions	0	775
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	664	1,432
Income Tax Reconciliation Foreign Income Tax Basis Differential	(15,078)	(5,760)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	18,544	7,947
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount	560	835
Income Tax Reconciliation Change In Foreign Enacted Tax Rate	(1,764)	111
Income Tax Reconciliation SubpartF	165	658
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	0	(572)
Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income	0	4,409
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount	(1,461)	(1,114)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	(51)	10
Income Tax Expense (Benefit)	$ 47,057	$ 37,695
Effective Income Tax Rate Reconciliation, Percent	21.70%	27.30%