Stock-Based Compensation Narrative (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Statement [Line Items]
Compensation expense	$ 1,619	$ 1,560
Stock-based compensation expense, net of tax benefit	$ 1,275	$ 1,229
Directors' Plan [Member]
Statement [Line Items]
Shares reserved for future grants under the stock option and compensation plan	259
Employee Equity Plan [Member]
Statement [Line Items]
Awards vesting period (in years)	3 years
Shares reserved for future grants under the stock option and compensation plan	10,200