Income Tax (Provision for Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 54,616	$ 51,931	$ 100,095	$ 80,895
Tax Adjustments, Settlements, and Unusual Provisions	0	(4,314)	0	(3,539)
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	627	(330)	1,292	1,103
Income Tax Reconciliation Foreign Income Tax Basis Differential	(5,997)	(1,132)	(21,076)	(6,892)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	4,662	3,079	23,207	10,501
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount	2,404	(2,036)	2,964	(1,201)
Income Tax Reconciliation Change In Foreign Enacted Tax Rate	94	145	(1,737)	417
Income Tax Reconciliation SubpartF	301	(348)	466	310
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	(415)	113	(107)	(459)
Effective Income Tax Rate Reconciliation Global Intangible Low Taxed Income	0	(119)	0	4,291
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount	3,694	3,135	5,155	4,250
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	3,376	(503)	3,596	(139)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	1,405	(437)	891	(428)
Income Tax Expense (Benefit)	$ 57,379	$ 42,914	$ 104,436	$ 80,609
Effective Income Tax Rate Reconciliation, Percent	22.10%	17.40%	21.90%	20.90%