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Commitments and Contingencies (Details Textual) (USD $) In Thousands, unless otherwise specified			12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2012 Letter Of Credit [Member]
Site Contingency, Accrual, Undiscounted Amount	$ 1,340	$ 1,921
Loss Contingency, Estimate of Possible Loss	11,925	13,349
Environmental Exit Costs, Anticipated Cost			2,000
Accounts Payable and Accrued Liabilities	$ 733	$ 0

Sum of the carrying values as of the balance sheet date of obligations incurred through that date, including liabilities incurred and payable to vendors for goods and services received, taxes, interest, rent and utilities, compensation costs, payroll taxes and fringe benefits (other than pension and postretirement obligations), contractual rights and obligations, and statutory obligations.

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