CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) (USD $) In Thousands, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Comprehensive income (loss)
Net income	$ 30,068	$ 25,357	$ 20,452	$ 28,366	$ 34,287	$ 23,599	$ 25,995	$ 27,012	$ 31,826	$ 32,266	$ 13,103	$ 26,671	$ 104,243		$ 110,893		$ 103,866
Other comprehensive income (loss), net of taxes:
Change in net unrealized gains and losses on fixed maturities and equity securities													163,564	[1],[2]	(248,410)	[1],[2]	114,178
Change in net funded status of pension and other postretirement benefit obligations													(1,177)	[1]	3,535	[1]	931
Other comprehensive income (loss)													162,387	[1]	(244,875)	[1]	115,109
Total													$ 266,630		$ (133,982)		$ 218,975

[1] All amounts are net of tax.

[2] The pretax amounts reclassified from accumulated other comprehensive income, $10,943 and $22,245, are included in net realized investment gains and losses and the related tax expenses, $3,830 and $7,786, are included in income tax expense in the Consolidated Statements of Operations for the years ended December 31, 2014 and 2013, respectively.