Investments (Net Unrealized Gains Losses on Investments by Asset Class) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Net unrealized gains (losses) on investments	$ 208,384		$ 185,050
Fixed Maturities [Member]
Net unrealized gains (losses) on investments	207,825		184,891
Equity Securities [Member]
Net unrealized gains (losses) on investments	3		2
Other Long-term Investments [Member]
Net unrealized gains (losses) on investments	568		374
Affiliated Notes [Member]
Net unrealized gains (losses) on investments	2,955		3,113
Securities Related to Other Than Temporary Impairments [Member] | Fixed Maturities [Member]
Net unrealized gains (losses) on investments	49		323
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Net unrealized gains (losses) on investments	$ (3,016)	[1]	$ (3,653)	[1]

[1] _____________ See Note 5 for more information on cash flow hedges.