Annual report pursuant to Section 13 and 15(d)

STOCK-BASED COMPENSATION (Fair value assumptions) (Details)

v3.3.1.900
STOCK-BASED COMPENSATION (Fair value assumptions) (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate, minimum 1.47% 1.67% 1.06%
Risk-free interest rate, maximum 1.75% 2.00% 1.89%
Dividend yield 0.00% 0.00% 0.00%
Volatility factors, minimum 34.20% 42.40% 48.20%
Volatility factors, maximum 43.40% 47.00% 48.40%
Weighted average expected life (in years) 5 years 11 months 9 days 6 years 22 days 5 years 10 months 13 days