Derivatives and Other Financial Instruments - Summary of derivatives on condensed consolidated financial statements of income (Details 1) (Foreign Currency Exchange Contracts, Other Expense: Gain (loss) on foreign currency exchange rate, Not designated as hedging instrument, USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Foreign Currency Exchange Contracts \| Other Expense: Gain (loss) on foreign currency exchange rate \| Not designated as hedging instrument
Derivatives, Fair Value [Line Items]
Derivatives, (Loss) Gain Recognized in Income	$ 21	$ (7)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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