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Share-Based Compensation Plans - Company's stock option exercise activity (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Share-Based Compensation Plans
Total intrinsic value of stock options exercised	$ 0	$ 11
Cash received from stock option exercises	0	7
Income tax benefit from the exercise of stock options	$ 0	$ 3

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- References

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
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- Definition

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

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-Topic 718
-SubTopic 10
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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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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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