Income Tax Income Tax (Provision for Income Tax Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Income Tax Disclosure [Abstract]
Effective Income Tax Rate Reconciliation at Federal Statutory Income Tax Rate, Amount	$ 69,804	$ 97,589
Effective Income Tax Rate Reconciliation, Foreign Income Tax Rate Differential, Amount	(3,221)	(2,388)
Income Tax Reconciliation Foreign Income Tax Basis Differential	250	900
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount	(3,157)	(22)
Effective Income Tax Rate Reconciliation, Tax Contingency, Domestic, Amount	778	1,099
Income Tax Reconciliation Change In Foreign Enacted Tax Rate	(17)	(1,371)
Income Tax Reconciliation Subpart F	2,439	465
Effective Income Tax Rate Reconciliation, Tax Credit, Foreign, Amount	855	670
Effective Income Tax Rate Reconciliation, Prior Year Income Taxes, Amount	(3,353)	(2,484)
Effective Income Tax Rate Reconciliation, Other Adjustments, Amount	108	174
Provision for income taxes	$ 62,776	$ 93,292
Effective Income Tax Rate Reconciliation, Percent	31.50%	33.50%