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Financial Instruments Foreign Exchange Summary (Details) (Not Designated as Hedging Instrument [Member], Foreign currency financial instruments [Member])
In Thousands, unless otherwise specified |
Dec. 31, 2012
USD ($)
|
Dec. 31, 2011
USD ($)
|
Sep. 30, 2011
USD ($)
|
Dec. 31, 2010
USD ($)
|
Dec. 31, 2012
Japanese Yen
USD ($)
|
Dec. 31, 2012
Japanese Yen
JPY (¥)
|
Dec. 31, 2011
Japanese Yen
USD ($)
|
Dec. 31, 2011
Japanese Yen
JPY (¥)
|
Dec. 31, 2012
Pound Sterling
USD ($)
|
Dec. 31, 2012
Pound Sterling
GBP (£)
|
Dec. 31, 2011
Pound Sterling
USD ($)
|
Dec. 31, 2011
Pound Sterling
GBP (£)
|
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|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Derivative [Line Items] | ||||||||||||||||
| Carrying amount | $ 24,742 | [1] | $ 23,736 | $ 23,736 | [1] | $ 137,823 | $ 1,695 | $ 1,899 | $ 23,047 | $ 21,837 | ||||||
| Notional amount | ¥ 146,991 | ¥ 146,241 | £ 14,186 | £ 14,055 | ||||||||||||
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