Hedging Activities - Narrative (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Derivatives Fair Value Line Items
Current Portion of Interest Rate Swaps	$ 0	$ 418
Derivative Liability Notional Amount		$ 15,000

Fair value of the gross liabilities less the gross assets of a derivative liability or group of derivative liabilities.

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