Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net income (loss)	$ 28,787	$ 50,050
Unrealized gains (losses) on investments available-for-sale:
Unrealized holding gains (losses) arising during the period	28,388	(9,090)
Less: Reclassification adjustments for gains included in earnings	(308)	(17,289)
Unrealized gains (losses) on investments available-for-sale, net	28,080	(26,379)
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 included in net periodic pension cost	150	643
Defined benefit pension plans, net	150	643
Other comprehensive income (loss) before tax	28,230	(25,736)
Income tax expense (benefit) related to components of other comprehensive income	9,873	(9,028)
Other comprehensive income (loss), net of tax	18,357	(16,708)
Comprehensive income	$ 47,144	$ 33,342