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Share-Based Compensation Plans - Company's stock option exercise activity (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Share-Based Compensation Plans
Total intrinsic value of stock options exercised	$ 77	$ 2,549	$ 88	$ 3,050
Net proceeds from stock option exercises	154	1,164	161	4,048
Income tax benefit from the exercise of stock options	$ 20	$ 663	$ 23	$ 793

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The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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Amount of cash inflow from exercise of stock options granted under share-based compensation arrangement.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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