Short-term Debt and Credit Lines (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Schedule of Short-Term Debt

Short-term debt at December 31, 2018 and 2017 consisted of:

	2018		2017
	(In thousands)
Notes payable to banks	$	4,560	$	8,300
Commercial paper		13,500		36,250
Total short-term debt	$	18,060	$	44,550