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Leased Properties (Details Textual) (USD $)	12 Months Ended
Leased Properties (Details Textual) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Leased Properties (Textual) [Abstract]
Total rental expense	$ 6,713,000	$ 6,182,000	$ 5,335,000

This element represents the payments that the lessee is obligated to make or can be required to make in connection with a property under the terms of an agreement classified as an operating lease, excluding contingent rentals and a guarantee by the lessee of the lessor's debt and the lessee's obligation to pay (apart from the rental payments) executory costs such as insurance, maintenance, and taxes.

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