Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Long-Term Debt

Long-term debt consisted of the following at December 31, 2017 and 2016 (in thousands):

	December 31,
	2017		2016
1.875% Senior notes, net of unamortized discount and debt issuance costs of $3,971 at December 31, 2017 and $7,823 at December 31, 2016	463,575		719,617
3.00% Senior notes, net of unamortized discount and debt issuance costs of $1,286 at December 31, 2016	—		248,714
4.15% Senior notes, net of unamortized discount and debt issuance costs of $3,372 at December 31, 2017 and $3,859 at December 31, 2016	421,628		421,141
4.50% Senior notes, net of unamortized discount and debt issuance costs of $891 at December 31, 2017 and $2,380 at December 31, 2016	174,325		347,620
5.45% Senior notes, net of unamortized discount and debt issuance costs of $4,159 at December 31, 2017 and $4,313 at December 31, 2016	345,841		345,687
Commercial paper notes	421,321		247,503
Variable-rate foreign bank loans	5,298		38,939
Other	5,384		41
Total long-term debt	1,837,372		2,369,262
Less amounts due within one year	422,012		247,544
Long-term debt, less current portion	$	1,415,360	$	2,121,718