Income Tax (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Income Tax Expense (Benefit), Intraperiod Tax Allocation [Abstract]
Provision for income taxes	$ 287,330,000	$ 217,526,000	$ 270,439,000
Income Tax Effects Allocated Directly to Equity [Abstract]
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	246,682,000	275,975,000	267,445,000
Income Tax Effects Allocated Directly to Equity, Employee Stock Options	(2,902,000)	(4,934,000)	2,255,000
Other Comprehensive Income (Loss), Foreign Currency Translation Gain (Loss) Arising During Period, Tax	(921,000)	1,579,000	(19,633,000)
Income Tax Effects Allocated Directly To Equity Employee Unrealized Pension And Post Retirement	2,779,000	8,581,000	(911,000)
Income Tax Expense (Benefit), Intraperiod Tax Allocation	$ 527,410,000	$ 481,565,000	$ 521,417,000