Long-Term Debt (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Long-Term Debt Instrument

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

(in thousands)	December 31, 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
Short-term promissory note	500			—
Total current portion of long-term debt	55,500			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	498,785			498,628
Total notes	598,785			598,628
Credit agreements:
5-year term loan facility, periodic interest and principal payments, LIBOR plus up to 1.750%, expires May 20, 2019	426,250			481,250
5-year revolving loan facility, periodic interest payments, currently LIBOR plus up to 1.500%, plus commitment fees up to 0.250%, expires May 20, 2019	—			—
Revolving credit loan, quarterly interest payments, LIBOR plus up to 1.400% and availability fee up to 0.250%, expires December 31, 2016	—			—
Total credit agreements	426,250			481,250
Debt issuance costs (contra)	(6,663		)	(8,260		)
Total long-term debt less unamortized discount and debt issuance costs	1,018,372			1,071,618
Current portion of long-term debt	55,500			73,125
Total debt	$	1,073,872		$	1,144,743