Investments (Summary Of Components Of Net Realized Capital Gains (Losses)) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments									$ (1,052)	$ (10,022)	$ (16,223)
Total net realized capital gains (losses)	94,629	44,958	33,905	126,735	19,518	62,743	(16,580)	98,719	300,227	164,400	6,923
Fixed Maturity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Other-than-temporary impairments									(1,052)	(10,022)	(16,223)
Gains (losses) from sales									6,792	14,708	20,378
Fixed Maturity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales									201	5,675	(905)
Gains (losses) from fair value adjustments									307	1,941	(15,518)
Equity Securities [Member] | Market Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales									2,648	14,920	38
Equity Securities [Member] | Fair Value [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales									32,747	21,031	8,021
Gains (losses) from fair value adjustments									258,569	116,163	11,130
Short-Term Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Gains (losses) from sales									$ 15	$ (16)	$ 2