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Capital Stock and Share Based Compensation Plans - Additional restricted stock and restricted stock unit vesting (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Restricted Stock Units (RSUs) [Member]
Dec. 31, 2012
Restricted Stock and Restricted Stock Units
Dec. 31, 2011
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Fair value of shares and units vested $ 16,565 $ 23,326 $ 27,933
Tax benefits realized on shares and units vested $ 6,212 [1] $ 8,747 [1] $ 10,475 [1]
[1] Benefits to be recognized in future years when realizable.