Significant Accounting Policies (Schedule of Fair Value Assumptions and Methodology) (Details)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Accounting Policies [Abstract]
Risk-free interest rate	2.43%	2.94%	2.23%
Dividend yield	0.50%	0.50%	0.50%
Volatility factors	31.20%	34.50%	37.60%
Weighted-average expected life	8 years	8 years	8 years