Summary of Investments (Maturities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Held-To-Maturity, Amortized Cost
Due in one year or less	$ 55
Due after one year through five years	200
Due after five years through 10 years	0
Due after 10 years	0
Amortized Cost	366us-gaap_HeldToMaturitySecurities	397us-gaap_HeldToMaturitySecurities
Held-To-Maturity, Fair Value
Due in one year or less	56
Due after one year through five years	200
Due after five years through 10 years	0
Due after 10 years	0
Fair Value	370	404
Available-For-Sale, Amortized Cost
Due in one year or less	242,924
Due after one year through five years	815,499
Due after five years through 10 years	853,096
Due after 10 years	449,009
Amortized Cost	2,799,672	2,845,217
Available-For-Sale, Fair Value
Due in one year or less	245,549
Due after one year through five years	854,281
Due after five years through 10 years	882,432
Due after 10 years	459,403
Fair Value	3,061,506us-gaap_AvailableForSaleSecurities	3,088,922us-gaap_AvailableForSaleSecurities
Trading, Amortized Cost
Due in one year or less	2,246
Due after one year through five years	7,361
Due after five years through 10 years	1,998
Due after 10 years	2,890
Amortized Cost	14,495	14,363
Trading, Fair Value
Due in one year or less	2,846
Due after one year through five years	7,914
Due after five years through 10 years	2,499
Due after 10 years	3,534
Fair Value	16,793us-gaap_TradingSecuritiesDebt	16,862us-gaap_TradingSecuritiesDebt
Asset-Backed Securities [Member]
Held-To-Maturity, Amortized Cost
Securities not categorized by contractual maturity	0
Held-To-Maturity, Fair Value
Securities not categorized by contractual maturity	0
Available-For-Sale, Amortized Cost
Securities not categorized by contractual maturity	4,858
Amortized Cost	4,858	2,741
Available-For-Sale, Fair Value
Securities not categorized by contractual maturity	5,151
Fair Value	5,151	3,018
Mortgage-Backed Securities [Member]
Held-To-Maturity, Amortized Cost
Securities not categorized by contractual maturity	111
Amortized Cost	111	142
Held-To-Maturity, Fair Value
Securities not categorized by contractual maturity	114
Fair Value	114	149
Available-For-Sale, Amortized Cost
Securities not categorized by contractual maturity	16,243
Amortized Cost	16,243	17,121
Available-For-Sale, Fair Value
Securities not categorized by contractual maturity	16,842
Fair Value	16,842	17,558
Collateralized Mortgage Obligations [Member]
Held-To-Maturity, Amortized Cost
Securities not categorized by contractual maturity	0
Held-To-Maturity, Fair Value
Securities not categorized by contractual maturity	0
Available-For-Sale, Amortized Cost
Securities not categorized by contractual maturity	345,805
Amortized Cost	345,805	335,092
Available-For-Sale, Fair Value
Securities not categorized by contractual maturity	354,297
Fair Value	354,297	337,289
Fixed Maturities [Member]
Held-To-Maturity, Amortized Cost
Amortized Cost	366	397
Held-To-Maturity, Fair Value
Fair Value	370	404
Available-For-Sale, Amortized Cost
Amortized Cost	2,727,434	2,773,566
Available-For-Sale, Fair Value
Fair Value	2,817,955	2,843,079
Trading, Amortized Cost
Amortized Cost	14,495
Trading, Fair Value
Fair Value	$ 16,793

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