Dividends (Dividends Paid In Total And Per Share) (Details) (USD $)	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Dividends [Abstract]
Total paid	$ 132,142,000	$ 129,863,000	$ 127,617,000
Per share	$ 2.41	$ 2.37	$ 2.33
Maximum dividend payable without prior permission of DOI of states domicile	179,000,000
Payments of ordinary dividends	0	128,000,000	110,000,000
Payments of extraordinary dividends	$ 270,000,000	$ 0	$ 0