Income Taxes - Provision for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Income Tax Contingency [Line Items]
Current Federal Tax Expense (Benefit)	$ 113,937	$ 88,302	$ 23,078
Current State and Local Tax Expense (Benefit)	19,416	13,482	636
Current Foreign Tax Expense (Benefit)	88,509	80,461	22,389
Current Income Tax Expense (Benefit)	221,862	182,245	46,103
Deferred Federal Income Tax Expense (Benefit)	25,729	12,143	20,905
Deferred State and Local Income Tax Expense (Benefit)	3,328	4,153	5,995
Deferred Foreign Income Tax Expense (Benefit)	(40,434)	837	(7,587)
Deferred income taxes	(11,377)	17,133	19,313
Provision for income taxes	$ 210,485	$ 199,378	$ 65,416