Securities In An Unrealized Loss Position Securities In An Unrealized Loss Position (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	$ 2,883,593	$ 3,441,075
Gross Unrealized Losses	78,934	117,453
Preferred stocks
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	25,353	33,159
Gross Unrealized Losses	3,365	6,319
Preferred stocks | Noninvestment Grade Investments [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of Securities	2
Aggregate fair value of securities in a continuous unrealized loss position	25,000
Gross Unrealized Losses	3,000
Common stocks
Schedule of Available-for-sale Securities [Line Items]
Aggregate fair value of securities in a continuous unrealized loss position	0	0
Gross Unrealized Losses	$ 0	$ 0