Investments (Net Unrealized Gains Losses on Investments by Asset Class) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Net unrealized gains (losses) on investments	$ 185,050		$ 377,322		$ 439,937
Fixed Maturities [Member]
Net unrealized gains (losses) on investments	184,891		375,409		436,812
Equity Securities [Member]
Net unrealized gains (losses) on investments	2		4		561
Other Long-term Investments [Member]
Net unrealized gains (losses) on investments	374		46		3
Affiliated Notes [Member]
Net unrealized gains (losses) on investments	3,113		4,386		5,263
Securities Related to Other Than Temporary Impairments [Member] | Fixed Maturities [Member]
Net unrealized gains (losses) on investments	323		545		(1,740)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Net unrealized gains (losses) on investments	$ (3,653)	[1]	$ (3,068)	[1]	$ (962)	[1]

[1] _____________ See Note 11 for more information on cash flow hedges.