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Leases (Details Textual) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Leases (Textual) [Abstract]
Rental payments under the terms of operating lease	$ 2,634	$ 2,583	$ 2,532
Percentage of increase under lease agreement (in hundredths)	2.00%
Total rent expense under operating lease agreements	$ 14,449	$ 12,485	$ 10,714

- Definition

The yearly payments due under the lease entered into in connection with the transaction involving the sale of property to another party and the lease of the property back to the seller.

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