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Share-Based Compensation - Schedule of assumptions used to determine fair value of options granted (Details) (Stock Option and Incentive Plan [Member])
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Stock Option and Incentive Plan [Member]
      
Assumptions used to determine fair value of options granted      
Dividend yield 0.00% 0.00% 0.00%
Expected volatility 34.40% [1] 36.80% [1] 33.10% [1]
Risk-free interest rate 1.50% [2] 0.70% [2] 1.30% [2]
Expected life of options 5 years [3] 5 years [3] 4 years 9 months 18 days [3]
Forfeiture rate 0.00% [3] 1.40% [3] 2.40% [3]
[1] Based on historical and implied volatility.
[2] Based on the U.S. Treasury yield curve in effect at the date of grant.
[3] Based on the Company's historical data and expected exercise behavior.