Annual report pursuant to Section 13 and 15(d)

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

v3.6.0.2
STOCK-BASED COMPENSATION (Fair value assumptions) (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract]      
Risk-free interest rate, minimum 1.24% 1.47% 1.67%
Risk-free interest rate, maximum 1.49% 1.75% 2.00%
Dividend yield 0.00% 0.00% 0.00%
Volatility factors, minimum 29.42% 34.18% 42.41%
Volatility factors, maximum 36.11% 43.36% 47.00%
Weighted average expected life (in years) 5 years 9 months 4 days 5 years 11 months 8 days 6 years 22 days