Condensed Consolidated Statements of Stockholder's Equity (USD $) In Thousands, unless otherwise specified	Total		Common stock	Additional paid-in capital	Accumulated other comprehensive income	Retained earnings
Beginning balance at Dec. 31, 2013	$ 1,875,732		$ 7,032	$ 774,115	$ 345,754	$ 748,831
Increase (Decrease) in Stockholder's Equity
Net income	94,751					94,751
Other comprehensive income, net of income taxes	151,266	[1]			151,266
Dividends	(92,801)					(92,801)
Capital contribution - stock-based compensation	650			650
Income tax benefit on stock-based compensation	27			27
Ending balance at Mar. 31, 2014	2,029,625		7,032	774,792	497,020	750,781
Beginning balance at Dec. 31, 2014	2,137,513		7,032	777,664	603,018	749,799
Increase (Decrease) in Stockholder's Equity
Net income	98,612					98,612
Other comprehensive income, net of income taxes	88,119	[1]			88,119
Dividends	(77,309)					(77,309)
Capital contribution - stock-based compensation	525			525
Income tax benefit on stock-based compensation	275			275
Ending balance at Mar. 31, 2015	$ 2,247,735		$ 7,032	$ 778,464	$ 691,137	$ 771,102

[1] Other comprehensive income includes the non-credit component of impaired gains (losses), net, on fixed maturities available-for-sale in the amounts of $(2,543) and $1,772 for the three months ended March 31, 2015 and 2014, respectively.