Accumulated Other Comprehensive Income (Loss) (Components of OCI) (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Foreign currency translation adjustments:
Translation adjustments arising during the period, before tax	$ 746	$ (4,191)
Translation adjustments arising during the period, income tax	0	0
Translation adjustments arising during the period, after tax	746	(4,191)
Unrealized gains on available-for-sale securities:
Unrealized gains for the period, before tax	27,738	49,078
Unrealized gains for the period, tax	(11,096)	(19,631)
Unrealized gains for the period, after tax	16,642	29,447
Reclassification adjustment for write-down and realization of loss (gain) on sale of available-for-sale securities included in net income, before tax	785	(551)
Reclassification adjustment for write-down and realization of loss (gain) on sale of available-for-sale securities included in net income, income tax	(314)	220
Reclassification adjustment for write-down and realization of loss (gain) on sale of available-for-sale securities included in net income, after tax	471	(331)
Total unrealized gains on available-for-sale securities, before tax	28,523	48,527
Total unrealized gains on available-for-sale securities, income tax	(11,410)	(19,411)
Total unrealized gains on available-for-sale securities, after tax	17,113	29,116
Pension and other postretirement plans:
Amortization of net prior service credit included in net income	(102)	(437)
Amortization of net prior service credit included in net income, income tax	40	175
Amortization of net prior service credit included in net income, after tax	(62)	(262)
Amortization of net actuarial (gain) loss included in net income, before tax	(7,182)	2,317
Amortization of net actuarial (gain) loss included in net income, income tax	2,873	(927)
Amortization of net actuarial (gain) loss included in net income, after tax	(4,309)	1,390
Settlement gain included in net income, before tax	0	(3,471)
Settlement gain included in net income, income tax	0	1,388
Settlement gain included in net income, after tax	0	(2,083)
Total pension and other postretirement plans, before tax	(7,284)	(1,591)
Total pension and other postretirement plans, income tax	2,913	636
Total pension and other postretirement plans, after tax	(4,371)	(955)
Cash flow hedge:
Gain for the period, before tax	172	30
Gain for the period, income tax	(69)	(12)
Gain for the period, after tax	103	18
Other Comprehensive Income, before tax	22,157	42,775
Other Comprehensive Income, income tax	(8,566)	(18,787)
Other Comprehensive Income, after tax	$ 13,591	$ 23,988