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Impairment and Closure Charges (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Impairment And Closure Charges Disclosure [Abstract]        
Impairment $ 0 $ 0 $ 0 $ 300,000
Closure charges 300,000 100,000 1,200,000 500,000
Impairment and closure $ 324,000 $ 122,000 $ 1,162,000 $ 844,000