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Stockholders' Equity (Stock Options Granted) (Details) (USD $)
 12 Months Ended
Dec. 31, 2011
April 19, 2011 [Member]
  
Grant Date [Line Items]  
Shares granted 410,000
Option exercise (strike) price $ 35.00
Closing stock price on date of grant $ 31.78
Options outstanding 410,000
Options vested 0
April 20, 2010 [Member]
  
Grant Date [Line Items]  
Shares granted 530,000
Option exercise (strike) price $ 30.00
Closing stock price on date of grant $ 27.13
Options outstanding 400,000
Options vested 0
April 21, 2009 [Member]
  
Grant Date [Line Items]  
Shares granted 790,000
Option exercise (strike) price $ 27.00
Closing stock price on date of grant $ 17.61
Options outstanding 600,000
Options vested 0
April 15, 2008 [Member]
  
Grant Date [Line Items]  
Shares granted 550,000
Option exercise (strike) price $ 27.00
Closing stock price on date of grant $ 24.35
Options outstanding 350,000
Options vested 0
April 17, 2007 [Member]
  
Grant Date [Line Items]  
Shares granted 4,380,000
Option exercise (strike) price $ 22.50
Closing stock price on date of grant $ 20.15
Options outstanding 3,372,750
Options vested 1,852,750