Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net income	$ 19,155	$ 23,812	$ 61,625	$ 65,361
Other comprehensive income (loss), before tax:
Change in net unrealized gains/losses during period	(3,322)	1,794	13,844	(39,547)
Reclassification adjustment for net (gains) losses included in income	8	(30)	(80)	(26)
Defined benefit post-retirement benefits plans:
Change in net actuarial loss	33	33	103	102
Other comprehensive income (loss), before tax	(3,281)	1,797	13,867	(39,471)
Deferred tax benefit (expense) related to other comprehensive income	1,291	(707)	(5,456)	15,532
Other comprehensive income (loss), net of tax	(1,990)	1,090	8,411	(23,939)
Comprehensive income, net of tax	$ 17,165	$ 24,902	$ 70,036	$ 41,422