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Organization and Summary of Significant Accounting Policies (Tables)
12 Months Ended
Dec. 31, 2011
Organization and Summary of Significant Accounting Policies [Abstract]  
Summary of fair value of subordinated notes
                                 
    December 31, 2011     December 31, 2010  
    Carrying Value     Fair Value     Carrying Value     Fair Value  

7.75% senior subordinated notes due 2016

  $ 375,000     $ 385,313     $ 375,000     $ 380,063  

3.5% senior subordinated convertible notes due 2026

    63,324       61,029       148,884       150,602  
A reconciliation of the number of shares used in the calculation of basic and diluted earning per share
                         
    Year Ended December 31,  
    2011     2010     2009  

Weighted average number of common shares outstanding

    91,154       92,018       91,557  

Effect of non-participatory equity compensation

    120       73       96  
   

 

 

   

 

 

   

 

 

 

Weighted average number of common shares outstanding, including effect of dilutive securities

    91,274       92,091       91,653