Accumulated Other Comprehensive Income (Loss) (Components of OCI) (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Foreign currency translation adjustments:
Translation adjustments arising during the period, before tax	$ 1,920	$ (3,509)	$ 2,666	$ (7,700)
Translation adjustments arising during the period, income tax	0	0	0	0
Translation adjustments arising during the period, after tax	1,920	(3,509)	2,666	(7,700)
Unrealized gains on available-for-sale securities:
Unrealized gains for the period, before tax	8,667	31,423	36,405	80,501
Unrealized gains for the period, tax	(3,466)	(12,569)	(14,562)	(32,200)
Unrealized gains for the period, after tax	5,201	18,854	21,843	48,301
Reclassification adjustment for realization of (gain) loss on exchange, sale or write-down of available-for-sale securities included in net income, before tax	(266,059)	(333)	(265,274)	(884)
Reclassification adjustment for realization of (gain) loss on exchange, sale or write-down of available-for-sale securities included in net income, income tax	106,424	133	106,110	353
Reclassification adjustment for realization of (gain) loss on exchange, sale or write-down of available-for-sale securities included in net income, after tax	(159,635)	(200)	(159,164)	(531)
Total unrealized gains on available-for-sale securities, before tax	(257,392)	31,090	(228,869)	79,617
Total unrealized gains on available-for-sale securities, income tax	102,958	(12,436)	91,548	(31,847)
Total unrealized gains on available-for-sale securities, after tax	(154,434)	18,654	(137,321)	47,770
Pension and other postretirement plans:
Amortization of net prior service credit included in net income	(102)	(384)	(204)	(821)
Amortization of net prior service credit included in net income, income tax	41	153	81	328
Amortization of net prior service credit included in net income, after tax	(61)	(231)	(123)	(493)
Amortization of net actuarial (gain) loss included in net income, before tax	(7,425)	2,004	(14,607)	4,321
Amortization of net actuarial (gain) loss included in net income, income tax	2,970	(801)	5,843	(1,728)
Amortization of net actuarial (gain) loss included in net income, after tax	(4,455)	1,203	(8,764)	2,593
Settlement gain included in net income, before tax	0	0	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	(7,527)	1,620	(14,811)	29
Total pension and other postretirement plans, income tax	3,011	(648)	5,924	(12)
Total pension and other postretirement plans, after tax	(4,516)	972	(8,887)	17
Cash flow hedge:
Gain for the period, before tax	239	214	411	244
Gain for the period, income tax	(95)	(86)	(164)	(98)
Gain for the period, after tax	144	128	247	146
Other Comprehensive (Loss) Income, before tax	(262,760)	29,415	(240,603)	72,190
Other Comprehensive (Loss) Income, income tax	105,874	(13,170)	97,308	(31,957)
Other Comprehensive (Loss) Income, after tax	$ (156,886)	$ 16,245	$ (143,295)	$ 40,233