Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Long-Term Debt Instrument

Long-term debt at December 31, 2018 and 2017 consisted of the following:

(in thousands)	December 31, 2018			December 31, 2017
Current portion of long-term debt:
Current portion of 5-year term loan facility expires 2022	$	35,000		$	20,000
4.500% Senior Notes, Series E, quarterly interest payments, balloon due 2018	—			100,000
Current portion of 5-year term loan credit agreement expires 2023	15,000			—
Total current portion of long-term debt	50,000			120,000
Long-term debt:
Note agreements:
4.200% Senior Notes, semi-annual interest payments, balloon due 2024	499,101			498,943
Total notes	499,101			498,943
Credit agreements:
5-year term loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022	330,000			365,000
5-year revolving loan facility, periodic interest payments, currently LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022	350,000			—
5-year term loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires December 21, 2023	$	285,000		$	—
Total credit agreements	965,000			365,000
Debt issuance costs (contra)	(7,111		)	(7,802		)
Total long-term debt less unamortized discount and debt issuance costs	1,456,990			856,141
Current portion of long-term debt	50,000			120,000
Total debt	$	1,506,990		$	976,141