Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2017

Debt Disclosure [Abstract]

Long-Term Debt Instrument

Long-term debt at September 30, 2017 and December 31, 2016 consisted of the following:

(in thousands)	September 30, 2017			December 31, 2016
Current portion of long-term debt:
Current portion of 5-year term loan facility expires June 28, 2022	$	20,000		$	55,000
4.500% senior notes, Series E, quarterly interest payments, balloon due 2018	100,000			—
Short-term promissory note	—			500
Total current portion of long-term debt	120,000			55,500
Long-term debt:
Note agreements:
4.500% senior notes, Series E, quarterly interest payments, balloon due 2018	—			100,000
4.200% senior notes, semi-annual interest payments, net of the unamortized discount, balloon due 2024	498,904			498,785
Total notes	498,904			598,785
Credit agreements:
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires June 28, 2022	370,000			426,250
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	370,000			426,250
Debt issuance costs (contra)	(8,163		)	(6,663		)
Total long-term debt less unamortized discount and debt issuance costs	860,741			1,018,372
Current portion of long-term debt	120,000			55,500
Total debt	$	980,741		$	1,073,872