Income Tax (Provision for Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 123,628	$ 74,826	$ 161,281	$ 139,270
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	(8,398)	(764)	(12,282)	(6,285)
Income Tax Reconciliation Foreign Income Tax Basis Differential	(5,553)	(6,931)	(14,489)	(13,601)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	4,288	4,967	9,287	11,758
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount	3,288	952	3,889	1,905
Income Tax Reconciliation SubpartF	738	11,452	1,433	17,886
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	(427)	(1,104)	(721)	(3,448)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	(442)	(212)	(316)	(4,977)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	(2)	213	146	(98)
Income Tax Expense (Benefit)	$ 117,120	$ 83,399	$ 148,228	$ 142,410
Effective Income Tax Rate Reconciliation, Percent	33.20%	39.00%	32.20%	35.80%