Derivative Instruments and Hedging Activities (Details Textuals) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2011	Dec. 31, 2010	Mar. 31, 2006
Derivative Instruments and Hedging Activities (Textuals)
Fair value of non-designated foreign exchange forward contracts	$ 300	$ (3,135)
Maximum maturities of Foreign exchange forward contracts	24 months
Number of Pay-fixed receive-variable interest rate swaps	1
Notional amount of two pay-fixed receive-variable interest rate swaps	25,000
Fair value of interest rate contracts	(3,441)	(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	$ 781

Derivative Instruments and Hedging Activities.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 17

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 17

+ Details

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-Subparagraph b(2)

+ Details

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- Definition

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

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- Definition

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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- Definition

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

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- Definition

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

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