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Share-Based Compensation - Additional Information (Details)
6 Months Ended
Jun. 30, 2019
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Long-term equity incentive plan, termination date May 01, 2023
Number of shares authorized under plan 10,600,000
Number of shares available for future grants under share-based plan 400,000
Performance Unit Awards  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Percentage of ROIC as performance measure 50.00%
Percentage of TSR as performance measure 50.00%