Income Tax (Provision for Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 118,760	$ 123,628	$ 191,506	$ 161,281
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	(4,261)	(8,398)	(10,413)	(12,282)
Income Tax Reconciliation Foreign Income Tax Basis Differential	(13,375)	(5,553)	(16,759)	(14,489)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	13,031	4,288	14,213	9,287
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount	(1,783)	3,288	(1,172)	3,889
Income Tax Reconciliation Change In Foreign Enacted Tax Rate	44	0	(1,193)	0
Income Tax Reconciliation SubpartF	1,140	738	1,326	1,433
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	(1,938)	(427)	(2,064)	(721)
Effective Income Tax Rate Reconciliation, Equity in Earnings (Losses) of Unconsolidated Subsidiary, Amount	2,609	0	4,464	0
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	(633)	(442)	(403)	(316)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	(1,251)	(2)	(1,120)	146
Income Tax Expense (Benefit)	$ 107,125	$ 117,120	$ 169,457	$ 148,228
Effective Income Tax Rate Reconciliation, Percent	31.60%	33.20%	31.00%	32.20%