Dividends (Dividends Paid In Total And Per Share) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Dividends [Abstract]
Total paid	$ 134,105,000	$ 132,142,000	$ 129,863,000
Per share (in dollars per share)	$ 2.4425	$ 2.41	$ 2.37
Maximum dividend payable without prior permission of DOI of states domicile	155,000,000
Payments of ordinary dividends	145,000,000	0	128,000,000
Payments of extraordinary dividends	$ 0	$ 270,000,000	$ 0