Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Debt

Debt comprised the following at December 31, 2017 and 2016:

(In thousands)	Maturity Dates	December 31, 2017		December 31, 2016
Unsecured private placement notes
3.95% (net of unamortized debt issuance cost of $346 and    $382 for 2017 and 2016, respectively)	2021-2027	$	99,654	$	99,618
3.86% (net of unamortized debt issuance cost of $343 and    $390 for 2017 and 2016, respectively)	2019-2025		99,657		99,610
4.86% (net of unamortized debt issuance cost of $191 and    $225 for 2017 and 2016, respectively)	2018-2023		55,523		64,775
5.88% (net of unamortized debt issuance cost of $95 and    $116 for 2017 and 2016, respectively)	2018-2022		28,476		34,170
5.69% (net of unamortized debt issuance cost of $12 and    $28 for 2017 and 2016, respectively)	2018		5,703		11,400
Debt of foreign subsidiaries
Unsecured bank debt, foreign currency	2018		1,786		432
Secured bank debt, foreign currency	2018		—		7,008
Total debt		$	290,799	$	317,013
Less current maturities			22,500		28,154
Long-term debt		$	268,299	$	288,859

Schedule of Net Interest Expense

Net interest expense for the years ended December 31, 2017, 2016 and 2015, comprised the following:  

(In thousands)	2017			2016			2015
Interest expense	$	14,428		$	15,240		$	15,488
Interest income		(2,075	)		(1,247	)		(217	)
		12,353			13,993			15,271
Capitalized interest		(909	)		(788	)		(738	)
Interest expense, net	$	11,444		$	13,205		$	14,533