Restatement of the June 30, 2013 Statements of Cash Flows (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Net cash provided by operating activities	$ 517,224	$ 466,408
Proceeds from sales, maturities and redemptions of investments:
Fixed maturities, available-for-sale	3,540,606	3,433,511
Purchases of investments:
Fixed maturities, available-for-sale	(1,811,311)	(2,152,210)
Proceeds from financing element derivatives	4,263	51,832
Payments for and interest (paid) received on financing element derivatives, net	(5,961)	(7,388)
Net cash provided by financing activities	645,219	436,337
As previously reported
Net cash provided by operating activities		510,852
Proceeds from sales, maturities and redemptions of investments:
Fixed maturities, available-for-sale		9,157,329
Purchases of investments:
Fixed maturities, available-for-sale		(7,876,028)
Proceeds from financing element derivatives		0
Payments for and interest (paid) received on financing element derivatives, net		0
Net cash provided by financing activities		391,893
Adjustments
Net cash provided by operating activities		(44,444)
Proceeds from sales, maturities and redemptions of investments:
Fixed maturities, available-for-sale		(5,723,818)
Purchases of investments:
Fixed maturities, available-for-sale		5,723,818
Proceeds from financing element derivatives		51,832
Payments for and interest (paid) received on financing element derivatives, net		(7,388)
Net cash provided by financing activities		44,444
Adjustment for derivative instruments not qualifying for hedge accounting due to ineffectiveness | Adjustments
Purchases of investments:
Net cash provided by financing activities		44,444
Accounting for forward settling to be announced (TBA) security transactions | Adjustments
Proceeds from sales, maturities and redemptions of investments:
Fixed maturities, available-for-sale		$ 5,723,818