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Stock-Based Compensation (Details)
3 Months Ended
Mar. 31, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award Activity  
Retirement age eligibility for employees 55 years
Retirement eligibility for employees, minimum years of service required 10 years
Percent of stock-based compensation related to retiree-eligible population (as a percent) 38.00%
Long Term Incentive Plan  
Share-based Compensation Arrangement by Share-based Payment Award Activity  
Number of shares authorized 123,965,000
Number of shares available for grant 25,900,000