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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, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Share-Based Compensation Plans
Total intrinsic value of stock options exercised	$ 0	$ 77	$ 0	$ 88
Net proceeds from stock option exercises		154	0	161
Income tax benefit from the exercise of stock options	$ 0	$ 20	$ 0	$ 23

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of cash inflow from exercise of option under share-based payment 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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