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Stockholders' Equity (Details 1)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Activity relating to common shares and certain information related to stock options and non-vested shares      
Preferred stock conversion     1,188
Options exercised 285    
Issued Shares [Member]
      
Activity relating to common shares and certain information related to stock options and non-vested shares      
Beginning balance, shares 41,100 40,407 40,215
Preferred stock conversion     1
Options exercised 285 160 1,995
Shares cancelled (146) (70) (2,104)
Restricted stock grant 650 600 300
Other adjustments   3  
Ending balance, shares 41,889 41,100 40,407
Treasury Shares [Member]
      
Activity relating to common shares and certain information related to stock options and non-vested shares      
Beginning balance, shares (1,018) (1,019) (1,809)
Options exercised (146) (70) (1,314)
Shares cancelled 146 70 2,104
Other adjustments   1  
Ending balance, shares (1,018) (1,018) (1,019)
Shares Held in Trust [Member]
      
Activity relating to common shares and certain information related to stock options and non-vested shares      
Beginning balance, shares     (631)
Options exercised     631
Ending balance, shares         
Outstanding Shares [Member]
      
Activity relating to common shares and certain information related to stock options and non-vested shares      
Beginning balance, shares 40,082 39,388 37,775
Preferred stock conversion     1
Options exercised 139 90 1,312
Restricted stock grant 650 600 300
Other adjustments   4  
Ending balance, shares 40,871 40,082 39,388