Derivative and Hedging Activities (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Derivatives Fair Value [Line Items]
Total derivatives liabilities, Fair value	$ 4.0	$ 6.4
Derivative And Hedging Activities Textuals [Abstract]
Notional amounts of interest swap agreements	325.0
Interest rate swaps [Member]
Derivatives Fair Value [Line Items]
Derivative Liability, Fair Value, Net	4.0	4.8
Interest rate swaps gain/loss to be reclassified during next 12 months	0
Derivative, Loss on Derivative	0
Foreign currency hedge contracts [Member]
Derivatives Fair Value [Line Items]
Derivative Asset, Fair Value, Net	0
Foreign currency hedge contracts gain/loss to be reclassified during next 12 months	0
Derivative, Gain on Derivative	$ 0

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Fair value as of the balance sheet date of the gross assets less the gross liabilities of a derivative asset or group of derivative assets.

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Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Increase in the fair value of the derivative or group of derivatives included in earnings in the period.

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Fair value as of the balance sheet date of the gross assets less the gross liabilities of a derivative liability or group of derivative liabilities.

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Decrease in the fair value of the derivative or group of derivatives included in earnings in the period.

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The estimated net amount of unrealized gains or losses on foreign currency cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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

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