Share-Based Arrangements (Stock Options Activity) (Details) - Stock Options - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Options, Outstanding [Roll Forward]
Outstanding at beginning of period (in shares)	736,364
Granted (in shares)	157,860
Exercised (in shares)	(113,369)
Forfeited or expired (in shares)	(8,230)
Outstanding at end of period (in shares)	772,625	736,364
Options, Weighted Average Exercise Price [Roll Forward]
Outstanding at beginning of period (in dollars per share)	$ 49.67
Granted (in dollars per share)	64.48
Exercised (in dollars per share)	34.92
Forfeited or expired (in dollars per share)	48.74
Outstanding at end of period (in dollars per share)	$ 54.87	$ 49.67
Options, Additional Disclosures [Abstract]
Weighted-average remaining contractual term - options outstanding	6 years 1 month 6 days
Aggregate intrinsic value - options outstanding				$ 4,283
Weighted-average exercise price - options outstanding (in dollars per share)	$ 54.87	$ 49.67		$ 54.87
Options exercisable (in shares)				387,738
Weighted-average remaining contractual term - options exercisable	4 years 9 months 18 days
Aggregate intrinsic value - options exercisable				$ 3,592
Weighted-average exercise price - options exercisable (in dollars per share)				$ 49.80
Intrinsic value of options exercised	$ 2,400	$ 6,200	$ 5,200
Options, Fair Value Assumptions and Methodology [Abstract]
Expected option term	4 years 10 months 24 days	4 years 10 months 24 days	4 years 10 months 24 days
Expected volatility	20.20%	19.40%	18.10%
Risk-free interest rate	1.40%	2.50%	2.60%
Expected dividend yield	1.30%	1.30%	1.50%
Per share fair value of options granted	$ 10.74	$ 11.18	$ 10.65