Fair Value Measurements (Various Instruments That Require Fair Value Measurement) (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pension assets	$ 156,741	[1]	$ 143,540	[1]
Foreign currency option contracts	9		15
Copper derivative contracts	809		267
Interest rate swap instrument	(332)		(361)
Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pension assets	106,619	[1]	98,269	[1]
Foreign currency option contracts	0		0
Copper derivative contracts	0		0
Interest rate swap instrument	0		0
Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pension assets	33,530	[1]	29,869	[1]
Foreign currency option contracts	9		15
Copper derivative contracts	809		267
Interest rate swap instrument	(332)		(361)
Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Pension assets	16,592	[1]	15,402	[1]
Foreign currency option contracts	0		0
Copper derivative contracts	0		0
Interest rate swap instrument	$ 0		$ 0

[1] Pension assets are recorded net of the projected benefit obligation as a long term pension liability, and are as of a April 30, 2013 valuation date.