Stock-Based Compensation Narrative (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement [Line Items]
Compensation expense	$ 1,911	$ 1,788	$ 3,530	$ 3,348
Stock-based compensation expense, net of tax benefit	$ 1,508	$ 1,376	$ 2,783	$ 2,605
Directors' Plan [Member]
Statement [Line Items]
Shares reserved for future grants under the stock option and compensation plan	181		181
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	9,300		9,300