XML 65 R54.htm IDEA: XBRL DOCUMENT v3.7.0.1
Stock Plans - Additional Information (Details)
3 Months Ended
Mar. 31, 2017
Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Percentage of target award based on achieving targeted performance conditions 0.00%
Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Percentage of target award based on achieving targeted performance conditions 200.00%
Percentage of target award based on achieving specified performance targets 189.20%
Performance Shares  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Fair value assumptions, average closing price used to calculate expected dividend rate, period (years) 1 year
Stock beta, daily price data period (years) 3 years
Performance Shares  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Award vesting period (in years) 3 years