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Stockholders' Equity and Comprehensive Income (Purchase of Parent's Common Stock) (Details) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stockholders' Equity Note [Abstract]      
Shares reserved for various stock compensation and purchase plans 11,500,000    
Shares Purchased in Connection with Restricted Stock Vestings and Stock Option Exercises 194,575,000 149,997,000 107,425,000
Cost of Shares Purchased in Connection with Restricted Stock Vestings and Stock Option Exercises $ 3,495 $ 2,741 $ 1,686