CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) [Abstract]
Net income (loss)	$ 72,017	$ 12,114	$ 177,521	$ (48,441)
Other comprehensive income (loss), net of tax (note 9):
Change in unrealized investment gains and losses (note 7)	(17,301)	7,277	66,798	(100,796)
Benefit plan adjustments	(1,732)	0	(5,198)	0
Foreign currency translation adjustment	(2,490)	1,885	(650)	(10,311)
Other comprehensive income (loss), net of tax	(21,523)	9,162	60,950	(111,107)
Comprehensive income (loss)	$ 50,494	$ 21,276	$ 238,471	$ (159,548)