Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation, Common Stock Repurchases and Dividends Schedule of Assumptions - Parenthetical (Details)

v2.4.0.8
Stock-Based Compensation, Common Stock Repurchases and Dividends Schedule of Assumptions - Parenthetical (Details) (Stock Options)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life of options (in years)   4 years 9 months 4 years 9 months
Minimum risk free interest rate 0.34% 0.59% 0.80%
Maximum risk free interest rate 1.34% 0.94% 2.05%
Expected minimum volatility rate 31.50% 43.80% 46.20%
Expected maximum volatility rate 43.70% 46.90% 48.40%
Minimum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life of options (in years) 2 years    
Expected dividend yield 0.00% 0.00% 2.70%
Maximum
     
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life of options (in years) 4 years 9 months    
Expected dividend yield 0.00% 9.90% 6.10%