Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2015

Debt Disclosure [Abstract]

Long-Term Debt Instrument

Long-term debt at December 31, 2015 and 2014 consisted of the following:

(in thousands)	December 31, 2015		December 31, 2014
Current portion of long-term debt:
Current portion of 5-year term loan facility expires 2019	$	48,125	$	20,625
5.370% senior notes, Series D, quarterly interest payments, balloon due 2015	—		25,000
5.660% senior notes, Series C, semi-annual interest payments, balloon due 2016	25,000		—
Total current portion of long-term debt	73,125		45,625
Long-term debt:
Note agreements:
5.660% senior notes, Series C, semi-annual interest payments, balloon due 2016	—		25,000
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	498,628		498,471
Total notes	598,628		623,471
Credit agreements:
5-year term-loan facility, periodic interest and principal payments, currently LIBOR plus up to 1.75%, expires May 20, 2019	481,250		529,375
5-year revolving-loan facility, periodic interest payments, currently LIBOR plus up to 1.50%, plus commitment fees up to 0.25%, expires May 20, 2019	—		—
Revolving credit loan, quarterly interest payments, LIBOR plus up to 1.40% and availability fee up to 0.25%, expires December 31, 2016	—		—
Total credit agreements	481,250		529,375
Total long-term debt	1,079,878		1,152,846
Current portion of long-term debt	73,125		45,625
Total debt	$	1,153,003	$	1,198,471