Share-Based Compensation Arrangements (Compensation Cost for Share-based Compensation Arrangements) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Share-based Payment Arrangement [Abstract]
Tax benefit from stock option exercises and other equity awards		$ 248	$ 496	$ 508
Share-based compensation expense		3,124	2,602	2,577
Related income tax benefit	[1]	$ 982	$ 1,108	$ 1,114

[1] Includes $248 thousand, $496 thousand, and $508 thousand, respectively, of excess tax benefits recognized upon the settlement of share-based compensation awards in 2019, 2018 and 2017.