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SUMMARIZED QUARTERLY FINANCIAL DATA (Unaudited) (Tables)
12 Months Ended
Dec. 31, 2012
Quarterly Financial Information Disclosure Abstract  
Schedule of Quarterly Financial Information [Table Text Block]
 Quarters Ended
 December 31 September 30 June 30 (2) March 31
 (amounts in thousands, except per share data)
2012           
Net revenues$ 102,092 $ 102,295 $ 104,571 $ 79,966
Operating income$ 30,951 $ 29,385 $ 5,368 $ 10,890
Net income (loss)$ 7,347 $ 8,177 $ (3,207) $ (1,049)
Basic net income (loss) per common share (1)$ 0.20 $ 0.22 $ (0.09) $ (0.03)
Weighted average basic common shares outstanding  36,935   36,735   36,686   36,483
Diluted net income (loss) per common share (1)$ 0.19 $ 0.22 $ (0.09) $ (0.03)
Weighted average diluted common and common equivalent shares outstanding  37,837   37,548   36,686   36,483
            
 Quarters Ended
 December 31 September 30 June 30 (3) March 31
 (amounts in thousands, except per share data)
2011           
Net revenues$ 95,134 $ 100,429 $ 104,650 $ 82,514
Operating income$ 25,920 $ 22,263 $ 24,015 $ 7,275
Net income$ 10,524 $ 8,231 $ 46,501 $ 1,021
Basic net income per common share (1)$ 0.29 $ 0.23 $ 1.28 $ 0.03
Weighted average basic common shares outstanding  36,380   36,367   36,353   36,053
Diluted net income per common share (1)$ 0.28 $ 0.22 $ 1.23 $ 0.03
Weighted average diluted common and common equivalent shares outstanding  37,473   37,463   37,742   37,865
Schedule of Error Corrections and Prior Period Adjustments [Table Text Block]
  Quarter Ended June 30, 2011
  As      
  Previously      
  Reported Adjustment As Revised
  (amounts in thousands, except per share data)
          
Income taxes (benefit) $(29,968) $ 2,233 $ (27,735)
Net income (loss) $ 48,734 $ (2,233) $ 46,501
Net income per share:         
Basic $ 1.34 $ (0.06) $ 1.28
Diluted $ 1.29 $ (0.06) $ 1.23