Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Long-Term Debt Instrument

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

(in thousands)	March 31, 2018			December 31, 2017
Current portion of long-term debt:
Current portion of 5-year term loan facility expires June 28, 2022	$	20,000		$	20,000
4.500% senior notes, Series E, quarterly interest payments, balloon due September 2018	100,000			100,000
Total current portion of long-term debt	120,000			120,000
Long-term debt:
Note agreements:
4.200% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2024	498,983			498,943
Total notes	498,983			498,943
Credit agreements:
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022	360,000			365,000
5-year revolving-loan facility, periodic interest payments, LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires June 28, 2022	—			—
Total credit agreements	360,000			365,000
Debt issuance costs (contra)	(7,435		)	(7,802		)
Total long-term debt less unamortized discount and debt issuance costs	851,548			856,141
Current portion of long-term debt	120,000			120,000
Total debt	$	971,548		$	976,141