Accumulated Other Comprehensive Income (Loss) (Reclassifications out of AOCI) (Details 3) (USD $) In Thousands, unless otherwise specified	3 Months Ended									9 Months Ended				12 Months Ended
	Sep. 30, 2013		Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012		Jun. 30, 2012	Mar. 31, 2012	Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012	Dec. 31, 2011
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
(Loss) Income from Discontinued Operations, Net of Tax	$ (25,872)		$ (7,620)	$ (21,224)	$ 5,600	$ 37,539		$ 10,264	$ 6,725	$ (54,716)		$ 54,528		$ 60,128	$ (34,231)
Interest expense	9,221		9,048	8,960	9,064	8,738		8,979	9,163	27,229		26,880		35,944	33,226
Other income (expense), net	8,110		(12,858)	(4,083)	(17,572)	4,163		(635)	8,588	(8,831)		12,116		(5,456)	(55,200)
Income Before Tax	87,296		87,254	44,283	(45,875)	93,408		65,683	42,043	218,833		201,134		155,259	255,788
Provision for Income Taxes	(31,000)		(34,500)	(17,800)	(5,100)	(37,000)		(23,900)	(17,200)	(83,300)		(78,100)		(83,200)	(104,400)
Income Net of Tax	56,296		52,754	26,483	(50,975)	56,408		41,783	24,843	135,533		123,034		72,059	151,388
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income Net of Tax	1,096					(56)				812		2,019
Foreign Currency Translation Adjustments [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
(Loss) Income from Discontinued Operations, Net of Tax	0					(1,409)				0		(888)
Unrealized Gain (Losses) on Available- for- Sale Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	0					0				(884)		(772)
Provision for Income Taxes	0					0				353		309
Income Net of Tax	0					0				(531)		(463)
Pension and Other Postretirement Plans [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income Before Tax	1,620					2,123				1,649		5,449
Provision for Income Taxes	(647)					(849)				(659)		(2,179)
Income Net of Tax	973					1,274				990		3,270
Amortization of net prior service credit [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income Before Tax	(384)	[1]				(469)	[1]			(1,205)	[1]	(1,390)	[1]
Amortization of net actuarial loss [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income Before Tax	2,004	[1]				2,592	[1]			6,325	[1]	6,839	[1]
Settlement gain [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Income Before Tax	0	[1]				0	[1]			(3,471)	[1]	0	[1]
Cash Flow Hedge [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]
Interest expense	205					132				588		167
Provision for Income Taxes	(82)					(53)				(235)		(67)
Income Net of Tax	$ 123					$ 79				$ 353		$ 100

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