CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net income (loss)	$ 45,522	$ 12,375	$ 105,504	$ (60,555)
Other comprehensive income (loss), net of tax (note 9):
Change in unrealized investment gains and losses (note 7)	44,501	(98,119)	84,099	(108,073)
Benefit plan adjustments	(1,980)	0	(3,466)	0
Foreign currency translation adjustment	587	(12,512)	1,840	(12,196)
Other comprehensive income (loss), net of tax	43,108	(110,631)	82,473	(120,269)
Comprehensive income (loss)	$ 88,630	$ (98,256)	$ 187,977	$ (180,824)