Shareholders' Equity - Stock Options, Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Stockholders' Equity Note [Abstract]
Outstanding, beginning of year		453	455	467
Exercised, Shares		(83)	(77)	(70)
Granted, Shares		102	84	91
Canceled, Shares		(14)	(9)	(33)
Outstanding Shares, end of year		458	453	455
Exercisable Shares, end of year	[1]	322	330	400
Outstanding, beginning of year, Weighted Average Exercise Price		$ 18.45	$ 16.33	$ 14.12
Exercised, Weighted Average Exercise Price		13.07	14.67	12.42
Granted, Weighted Average Exercise Price		26.97	27.35	28.21
Canceled, Weighted Average Exercise Price		26.77	26.73	26.41
Outstanding, end of year, Weighted Average Exercise Price		21.08	18.45	16.33
Exercisable, end of year, Weighted Average Exercise Price	[1]	$ 18.89	$ 15.77	$ 15.57
Outstanding, end of year, Aggregate Intrinsic value	[2]	$ 3,684
Exercisable, end of year, Aggregate Intrinsic value	[1],[2]	$ 3,297

[1] The weighted average remaining contractual life of stock options outstanding and exercisable on December 31, 2019 was 6.1 years and 5.1 years, respectively.

[2] The aggregate intrinsic value of stock option in the table above represents the total pre-tax intrinsic value (the amount by which the current market value of the underlying stock exceeds the exercise price of the option) that would have been received by the option holders had all option holders exercised their options on December 31, 2019. This amount changes based on changes in the market value of the Company’s stock.