Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Schedule of Long-Term Debt

Long-term debt at September 30, 2019 and December 31, 2018 consisted of the following:  

(in thousands)	September 30, 2019			December 31, 2018
Current portion of long-term debt:
Current portion of 5-year term loan facility expires 2022	$	40,000		$	35,000
Current portion of 5-year term loan facility expires 2023		15,000			15,000
Total current portion of long-term debt		55,000			50,000
Long-term debt:
Note agreements:
4.200% senior notes, semi-annual interest payments, net of the unamortized discount,    balloon due 2024	$	499,219		$	499,101
4.500% senior notes, semi-annual interest payments, net of the unamortized discount,    balloon due 2029		349,470			—
Total notes		848,689			499,101
Credit agreements:
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to    1.750%, expires June 28, 2022		300,000			330,000
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		100,000			350,000
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to    1.750%, expires December 21, 2023		273,750			285,000
Total credit agreements		673,750			965,000
Debt issuance costs (contra)		(8,879	)		(7,111	)
Total long-term debt less unamortized discount and debt issuance costs		1,513,560			1,456,990
Current portion of long-term debt		55,000			50,000
Total debt	$	1,568,560		$	1,506,990