Annual report pursuant to Section 13 and 15(d)

Stock-Based Compensation Schedule of Assumptions (Details)

v3.7.0.1
Stock-Based Compensation Schedule of Assumptions (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Expected life of options (in years) 4 years 273 days 4 years 273 days 4 years 273 days
Minimum risk free interest rate 1.10% 1.30% 1.36%
Maximum risk free interest rate 1.40% 1.60% 1.61%
Expected minimum volatility rate 57.40% 34.50% 33.10%
Expected maximum volatility rate 63.70% 53.20% 34.50%
Expected dividend yield 0.00% 0.00% 0.00%