Derivative Instruments and Hedging Activities (Details Textuals) (USD $) In Thousands, unless otherwise specified	3 Months Ended	9 Months Ended
Sep. 30, 2011 Derivative Year	Sep. 30, 2011 Year Segments Derivative	Dec. 31, 2010	Mar. 31, 2006
Derivative Instruments and Hedging Activities (Textuals)
Fair value of investment hedge contracts	$ 1,780	$ 1,780
Gain on investment hedge derivative	1,780	1,780
Maximum maturities of Foreign exchange forward contracts	24 months	24 months
Fair value of non-designated foreign exchange forward contracts	3,552	3,552	(3,135)
Notional amount of two pay-fixed receive-variable interest rate swaps	25,000	25,000
Number of Pay-fixed receive-variable interest rate swaps	1	1
Fair value of interest rate contracts	(4,012)	(4,012)	(3,371)
Notional amount related to senior notes issuance				200,000
Anticipated reclassification from other comprehensive income to interest expense within the next 12 months	$ 752	$ 752

Derivative Instruments and Hedging Activities.

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Fair value as of the balance sheet date of all foreign currency derivatives not designated as hedging instruments.

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Fair value as of the balance sheet date of all interest rate derivatives designated as cash flow hedging instruments.

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The estimated net amount of unrealized gains or losses on interest rate cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

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Maximum amount of time remaining before foreign currency exchange rate derivatives mature or expire.

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Net fair value of all derivatives designated as hedges of net investment in foreign operations.

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Aggregate notional amount of all derivatives designated as cash flow hedging instruments. The notional amount relates to a number of currency units, shares, bushels, pounds, or other units specified in a derivative instrument.

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Aggregate notional amount of interest rate derivatives, which relates to the currency amount specified in the interest rate derivative instruments.

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Number of interest rate derivative instruments held by the entity at the reporting date.

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Current period adjustment in other comprehensive income reflecting gains or losses on foreign currency transactions that are designated as, and are effective as, hedges of a net investment in a foreign entity, net of tax effect.

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