Derivative Instruments and Hedging Activities (Textuals) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2011	Dec. 31, 2010	Mar. 31, 2006
Derivative Instruments and Hedging Activities (Textuals)
Fair value of investment hedge contracts	$ 1,768
Gain on investment hedge derivative	1,768
Maximum remaining maturity of foreign currency derivatives	24 months
Fair value of non-designated foreign exchange forward contracts	(1,558)	(3,135)
Fair value of interest rate contracts	(3,796)	(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	719
Interest rate swap [Member]
Derivative Instruments and Hedging Activities (Textuals)
Notional amount of pay-fixed receive-variable interest rate swaps	$ 25,000

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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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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 133

-Paragraph 17

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 815

-SubTopic 10

-Section 45

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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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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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