Income Taxes - Provision for Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Disclosure [Abstract]
Current Federal Tax Expense (Benefit)	$ 134,276	$ 113,937	$ 88,302
Current State and Local Tax Expense (Benefit)	22,072	19,416	13,482
Current International Tax Expense (Benefit)	52,708	88,509	80,461
Current Income Tax Expense (Benefit)	209,056	221,862	182,245
Deferred Federal Income Tax Expense (Benefit)	9,690	25,729	12,143
Deferred State and Local Income Tax Expense (Benefit)	2,572	3,328	4,153
Deferred International Income Tax Expense (Benefit)	(17,676)	(40,434)	837
Deferred income taxes	(5,414)	(11,377)	17,133
Provision for income taxes	$ 203,642	$ 210,485	$ 199,378