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Acquisition (Schedule of Recognized Identified Assets Acquired and Liabilities Assumed) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Business Acquisition [Line Items]      
Goodwill $ 20,268 $ 20,268 $ 20,479
North Jackson Facility [Member]
     
Business Acquisition [Line Items]      
Property, plant and equipment     94,102
Non-compete agreement     1,330
Goodwill     20,268
Accounts payable     (4,264)
Accrued expenses and other current liabilities     (138)
Net assets acquired     $ 111,298