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Derivative Instruments (Narrative) (Details) (USD $)	3 Months Ended
Derivative Instruments (Narrative) (Details) (USD $)	Mar. 31, 2013	Mar. 31, 2012
Derivatives, Fair Value [Line Items]
Derivative liability		$ 1,100,000
Euro Forward Contracts [Member]
Derivatives, Fair Value [Line Items]
Cash flow hedges expected to be reclassified to earnings		900,000
Notional amount of derivatives	67,500,000
Interest Rate Swap Agreements [Member]
Derivatives, Fair Value [Line Items]
Notional amount of derivatives	114,500,000	199,000,000
Hedge ineffectiveness recorded to income	$ 0	$ 0

Carrying amount as of the balance sheet date of the liability arising from a financial instrument or a contract used to mitigate a specified risk (hedge), and which are expected to be converted into cash or otherwise disposed of within a year or the normal operating cycle, if longer.

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