Financial Instruments Commodity Contracts (Details) - Jun. 30, 2015 - Commodity $ in Thousands	USD ($) lb oz T
Silver, Ounces
Derivative [Line Items]
Amount | oz	855,000
Notional Value	$ 14,000
Gold, Ounces | Not Designated as Hedging Instrument
Derivative [Line Items]
Amount | oz	1,100
Notional Value	$ 1,300
Copper, Pounds
Derivative [Line Items]
Notional Value	$ 900
Copper, Pounds | Not Designated as Hedging Instrument
Derivative [Line Items]
Amount | lb	350,000
Tin, Metric Tons | Not Designated as Hedging Instrument
Derivative [Line Items]
Amount | T	40
Notional Value	$ 600