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Share-Based Compensation - Stock Option Plan Details (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Intrinsic value of options exercised	$ 366	$ 767	$ 2,807
Cash received from options exercised	276	738	2,835
Excess tax benefit realized for option exercises	$ 46	$ 142	$ 805

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Amount of tax benefit from exercise of stock options granted under share-based compensation arrangement.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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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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