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Description of Business and Significant Accounting Policies (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Income from continuing operations $ (22,085) $ (6,026) $ (4,081) $ (10,071) $ (8,642) $ 7,698 $ 11,011 $ 16,462 $ (42,263) $ 26,529 $ 190,502
Number of weeks in each fiscal quarter for 52-week fiscal year                 91 days    
Revenue Recognition                      
Revenue retention percentage                 10.00%