Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Net income (loss)	$ 50,050	$ (26,586)
Unrealized gains (losses) on investments available-for-sale:
Unrealized holding gains arising during the period	(9,090)	6,909
Less: Reclassification adjustments for gains included in earnings	(17,289)	(12,958)
Unrealized gains on investments available-for-sale, net	(26,379)	(6,049)
Defined benefit pension plans:
Prior service cost arising during the period	0	0
Net loss arising during the period	0	0
Less: Amortization of prior service cost and net loss inluded in net periodic pension cost	643	1,038
Defined benefit pension plans, net	643	1,038
Other comprehensive income, before tax	(25,736)	(5,011)
Income tax expense (benefit) related to components of other comprehensive income	(9,028)	401
Other comprehensive (loss) income, net of tax	(16,708)	(5,412)
Comprehensive income (loss)	$ 33,342	$ (31,998)