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Capital Lease Obligations (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010
Components of Capital Lease Obligations
Capital leases for equipment (various leases extending into 2016, with implicit interest rates ranging up to to 6.9%, monthly payments totaling $71 and quarterly payments totaling $242	$ 1,144	$ 1,824
Less: Current portion of capital lease obligations	470	1,673
Capital lease obligations, less current portion	674	151
Payments due under future minimum lease payments under capital lease obligations
2012	487
2013 and thereafter	714
Total	1,201
Less: Portion representing interest	57
Present value of minimum lease payments	1,144
Capital Lease Obligations (Textual) [Abstract]
Implicit interest rate on capital leases, Maximum	6.90%
Monthly payments on capital leases	71
Quarterly payments on capital leases	$ 242

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Amount equal to the present value (the principal) at the beginning of the lease term of minimum lease payments during the lease term (excluding that portion of the payments representing executory costs such as insurance, maintenance, and taxes to be paid by the lessor, together with any profit thereon) net of payments or other amounts applied to the principal through the balance sheet date.

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