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Earnings Per Share - Narrative (Details) - shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Outstanding stock options (in shares) 973,896 1,300,000 973,896 1,300,000 1,186,180
Stock options          
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]          
Antidilutive securities excluded from EPS computation (in shares) 0 100,000 200,000 100,000  
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)     315,561 324,434