Common Stock (Stock Repurchase Program) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	9 Months Ended	165 Months Ended
	Sep. 30, 2012	Sep. 30, 2012
Shares repurchased	0	25,406,184	[1],[2]
Cost, including commission		$ 423,647	[1]
Total Remaining Shares Available For Repurchase at September 30, 2012	393,816	393,816
Treasury shares acquired outside of repurchase programs		86,735

[1] Represents repurchased shares and cost since inception of the stock repurchase program in 1999.

[2] Shares repurchased does not include 86,735 treasury shares related to employee compensation arrangements outside of the Company's repurchase programs.