Consolidated Statements of Stockholder's Equity (USD $) In Thousands, unless otherwise specified		Total	Common stock	Additional paid-in capital	Accumulated other comprehensive income (loss)	Retained earnings
Balances at Dec. 31, 2009	[1]	$ 1,266,527	$ 7,032	$ 761,330	$ (140,146)	$ 638,311
Increase (Decrease) in Stockholder's Equity
Net income	[1]	195,534				195,534
Other comprehensive income (loss), net of income taxes	[1]	409,454			409,454
Dividends		(160,917)				(160,917)
Capital contribution - stock-based compensation		1,855		1,855
Income tax benefit on stock-based compensation		1,459		1,459
Balances at Dec. 31, 2010	[1]	1,713,912	7,032	764,644	269,308	672,928
Increase (Decrease) in Stockholder's Equity
Net income	[1]	202,237				202,237
Other comprehensive income (loss), net of income taxes	[1]	200,674			200,674
Dividends		(206,353)				(206,353)
Capital contribution - stock-based compensation		1,786		1,786
Income tax benefit on stock-based compensation		1,817		1,817
Balances at Dec. 31, 2011	[1]	1,914,073	7,032	768,247	469,982	668,812
Increase (Decrease) in Stockholder's Equity
Net income		238,114				238,114
Other comprehensive income (loss), net of income taxes		165,717			165,717
Dividends		(184,401)				(184,401)
Capital contribution - stock-based compensation		2,314		2,314
Income tax benefit on stock-based compensation		480		480
Balances at Dec. 31, 2012		$ 2,136,297	$ 7,032	$ 771,041	$ 635,699	$ 722,525

[1] As adjusted; See Note 1