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Common Stock - Non-vested Performance-based Units Activity (Details) (2003 LTIP, Performance units, USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
2003 LTIP | Performance units
     
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]      
Nonvested Performance Shares outstanding, January 1, 2012 412,689    
Granted 224,560 220,305 297,695
Vested (132,963) [1]    
Forfeited (183,801) [2]    
Nonvested Performance Shares outstanding, December 31, 2012 320,485 412,689  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]      
Nonvested Performance Shares outstanding, January 1, 2012 $ 61.73    
Granted $ 71.73 $ 63.89 $ 56.64
Vested $ 65.45 [1]    
Forfeited $ 65.98 [2]    
Nonvested Performance Shares outstanding, December 31, 2012 $ 67.97 $ 61.73  
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Additional Disclosures [Abstract]      
Performance units vested and paid during period 2,366    
[1] Represents the entire amount of Performance Shares which vested during the year ended December 31, 2012. Of the Performance Shares which vested, 2,366 were paid out in 2012 and the remaining were outstanding as of December 31, 2012.
[2] Includes reductions due to employee terminations and reductions as a result of the Company not meeting certain performance targets.