Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense	$ 9,330		$ 9,221		$ 26,707		$ 27,229
Income tax on unrealized gains on available-for-sale securities reclassified out of accumulated other comprehensive income					106,110		353
Other income (expense), net	(64,526)		(8,110)		(465,913)		8,831
Amortization of net prior service credit included in net income	(101)		(384)		(305)		(1,205)
Amortization of net actuarial (gain) loss included in net income	(7,425)		2,004		(22,032)		6,325
Settlement gain included in net income	0		0		0		3,471
Income Before Tax	(141,619)		(84,312)		(802,853)		(200,537)
Provision for Income Taxes	58,200		29,900		214,200		77,400
Income Net of Tax	(83,419)		(54,412)		(588,653)		(123,137)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income Net of Tax	(4,385)		1,096		(172,179)		812
Unrealized Gain on Available-for-Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income tax on unrealized gains on available-for-sale securities reclassified out of accumulated other comprehensive income	0	[1]	0	[1]	106,110	[1]	353	[1]
Other income (expense), net	0		0		(265,274)		(884)
Provision for Income Taxes					1,200
Income Net of Tax	0		0		(159,164)		(531)
Unrealized Gain on Available-for-Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member] | Berkshire Exchange Transaction [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income tax on unrealized gains on available-for-sale securities reclassified out of accumulated other comprehensive income					107,300
Pension and Other Postretirement Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Amortization of net prior service credit included in net income	(101)	[2]	(384)	[2]	(305)	[2]	(1,205)	[2]
Amortization of net actuarial (gain) loss included in net income	(7,425)	[2]	2,004	[2]	(22,032)	[2]	6,325	[2]
Settlement gain included in net income	0	[2]	0	[2]	0	[2]	(3,471)	[2]
Income Before Tax	(7,526)		1,620		(22,337)		1,649
Provision for Income Taxes	3,011		(647)		8,935		(659)
Income Net of Tax	(4,515)		973		(13,402)		990
Cash Flow Hedge [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense	217		205		645		588
Provision for Income Taxes	(87)		(82)		(258)		(235)
Income Net of Tax	$ 130		$ 123		$ 387		$ 353

[1] Benefits of $1.2 million were recorded in Provision for Income Taxes related to the realized loss for the nine months ended September 30, 2014. The remaining $107.3 million for the nine months ended September 30, 2014, relates to the reversal of income taxes previously recorded on the unrealized gain of the Company’s investment in Berkshire Hathaway Inc. marketable equity securities as part of the Berkshire exchange transaction, which qualified as a tax-free distribution under IRC Section 355 and 361 (see Note 4). The amounts for the nine months ended September 30, 2013 were recorded in Provision for Income Taxes.

[2] These accumulated other comprehensive income components are included in the computation of net periodic pension and postretirement plan cost (see Note 9).