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Earnings Per Share (Tables)
6 Months Ended
Jun. 30, 2012
Earnings Per Share [Abstract]  
Schedule Computing Earnings Per Share
  Three Months Ended Six Months Ended
  June 30, June 30,
(in thousands, except market price data) 2012 2011 2012 2011
         
Net income/(loss) available to common shareholders ($33,745) $8,762 $13,296 $25,495
         
Weighted average number of shares:        
         
Weighted average number of shares used in        
calculating basic net income per share 31,349 31,263 31,329 31,243
         
Effect of dilutive stock-based compensation plans:        
         
Stock options - 144 69 130
         
Long-term incentive plan - 82 120 82
         
Weighted average number of shares used in        
calculating diluted net income per share 31,349 31,489 31,518 31,455
         
Effect of stock-based compensation plans        
that were not included in the computation of        
diluted earnings per share because        
to do so would have been antidilutive - - - -
         
Average market price of common stock used        
for calculation of dilutive shares $20.22 $25.32 $22.08 $24.57
         
Net income/(loss) per share:        
         
Basic ($1.08) $0.28 $0.42 $0.82
         
Diluted ($1.08) $0.28 $0.42 $0.81
         
As of June 30, 2012 and 2011, there was no dilution resulting from the convertible debt instrument, purchased call option, and warrant that are described in Note 11.    
 
Schedule of Shares Issued and Outstanding
  Class A   Class B   Less: Treasury   Net shares
  Shares   Shares   Shares   Outstanding
               
June 30, 2011 36,515,942   3,236,098   (8,479,487)   31,272,553
March 31, 2012 36,585,004   3,236,098   (8,479,487)   31,341,615
June 30, 2012 36,589,304   3,236,098   (8,467,873)   31,357,529