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Stock-based Compensation - Cash proceeds, tax benefits and intrinsic value related to total stock options exercised (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stock-Based Compensation
Proceeds from stock options exercised	$ 332	$ 776	$ 372
Tax benefits realized from stock compensation	50	5	99
Intrinsic value of stock options exercised	$ 1,022	$ 4,958	$ 3,888

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Amount of tax benefit from exercise of option 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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