Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Schedule of Assumptions (Details)

v3.3.1.900
Stock-Based Compensation Schedule of Assumptions (Details) - Stock options
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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 1.40% 0.30% 0.60%
Maximum risk free interest rate 1.60% 1.30% 0.90%
Expected minimum volatility rate 33.10% 31.50% 43.80%
Expected maximum volatility rate 34.50% 43.70% 46.90%
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% 0.00%
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% 0.00% 9.90%