Income Tax (Provision for Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 100,660	$ 49,048	$ 261,941	$ 188,318
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	(2,335)	(96)	(14,617)	(5,685)
Income Tax Reconciliation Foreign Income Tax Basis Differential	(7,078)	(16,221)	(21,567)	(29,822)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	4,411	10,239	13,698	21,997
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount	(3,979)	(2,580)	(175)	(675)
Income Tax Reconciliation Change In Foreign Enacted Tax Rate	0	0	0	(58)
Income Tax Reconciliation SubpartF	1,779	12,188	3,212	30,074
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	(1,934)	(1,106)	(2,655)	(4,554)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	(1,996)	3,747	(2,227)	(1,774)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	(647)	1,384	(501)	1,076
Income Tax Expense (Benefit)	$ 88,881	$ 56,603	$ 237,109	$ 199,013
Effective Income Tax Rate Reconciliation, Percent	30.90%	40.40%	31.70%	37.00%