Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2016

Debt Disclosure [Abstract]

Long-Term Debt Instrument

Long-term debt at September 30, 2016 and December 31, 2015 consisted of the following:

(in thousands)	September 30, 2016			December 31, 2015
Current portion of long-term debt:
Current portion of 5-year term loan facility expires 2019	$	55,000		$	48,125
5.660% senior notes, Series C, semi-annual interest payments, balloon due 2016	25,000			25,000
Short-term promissory note	492			—
Total current portion of long-term debt	80,492			73,125
Long-term debt:
Note agreements:
4.500% senior notes, Series E, quarterly interest payments, balloon due 2018	100,000			100,000
4.200% senior notes, semi-annual interest payments, balloon due 2024	498,746			498,628
Total notes	598,746			598,628
Credit agreements:
5-year term-loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires May 20, 2019	440,000			481,250
5-year revolving-loan facility, periodic interest payments, currently LIBOR plus up to 1.500% and commitment fees up to 0.250%, expires May 20, 2019	—			—
Total credit agreements	440,000			481,250
Debt issuance costs (contra)	(7,053		)	(8,260		)
Total long-term debt less unamortized discount and debt issuance costs	1,031,693			1,071,618
Current portion of long-term debt	80,492			73,125
Total debt	$	1,112,185		$	1,144,743