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Incentive Stock Plans - Non-Qualified Employee Stock Options - Narrative (Details) - Stock Options - shares
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Maximum term (in years) 10 years  
Award vesting period (in years) 3 years  
Expense recognition method, years 3 years  
Shares granted (in shares) 0 0