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Earnings Per Share Narrative (Details) - shares
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Outstanding stock options (in shares) 1,194,889 2,100,000 1,194,889 2,100,000 1,976,326
Stock options          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from EPS computation (in shares) 100,000 400,000 100,000 400,000  
Performance Vested Restricted Stock Units          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
PVRSUs excluded from EPS calculation due to performance conditions not met (in shares)     318,215 297,548