Income Tax Income Tax (Provision for Income Tax Expense) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 74,826	$ 105,187	$ 139,270	$ 174,991
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	(764)	(4,676)	(6,285)	(7,896)
Income Tax Reconciliation Foreign Income Tax Basis Differential	(6,931)	(3,564)	(13,601)	(3,314)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	4,967	2,510	11,758	(647)
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount	952	778	1,905	1,556
Income Tax Reconciliation SubpartF	11,452	3,691	17,886	6,129
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	(1,104)	(1,155)	(3,448)	(2,010)
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	(212)	114	(4,977)	(3,237)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	213	(646)	(98)	(557)
Income Tax Expense (Benefit)	$ 83,399	$ 102,239	$ 142,410	$ 165,015
Effective Income Tax Rate Reconciliation, Percent	39.00%	34.00%	35.80%	33.00%