Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income before income taxes:
United States	$ 145,856	$ 176,739	$ 225,334
Foreign	632,985	540,013	438,354
Income before income taxes	778,841	716,752	663,688
Current tax provision:
United States	54,649	44,769	77,590
Foreign	163,060	128,608	79,607
Provision for income taxes, current	217,709	173,377	157,197
Deferred tax provision (benefit):
United States	7,749	17,733	3,020
Foreign	(6,125)	(3,200)	1,058
Provision for income taxes, deferred	1,624	14,533	4,078
Provision for income taxes	219,333	187,910	161,275
Foreign tax loss and credit carryforwards	54,946
State tax credit carry forwards, net of federal benefit	3,517
Foreign tax losses and credit carry forwards that will either expire or be refunded at various dates through 2027	32,603
State tax credit carry forwards, net of federal benefits will either expire or be refunded at various dates through 2027	45
Valuation allowance, related to the foreign net operating loss carryforwards and U.S. state tax credits	17,896	19,129
Change in the valuation allowance, related to foreign net operating loss and foreign and U.S. state credit carryforwards	$ (1,233)	$ (962)