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Earnings Per Share - Additional Information (Details) - $ / shares
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2018
Earnings Per Share      
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount (in shares) 346,000 347,000 207,000
Weighted Average Price of Antidilutive Securities Excluded from Computation of Earnings Per Share (in dollars per share) $ 29.49 $ 29.50 $ 27.94