Debt (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Long-term debt

Debt consisted of the following:

		December 31, 2017
(in thousands)	Maturity	Gross			Debt Issuance Costs			Net Carrying Amount
Amended Revolving Credit Facility	2019 - 2020	$	40,000		$	-		$	40,000
2.75% Senior Notes	2019		499,334			(1,375	)		497,959
2.80% Senior Notes	2020		599,011			(2,390	)		596,621
3.50% Senior Notes	2022		399,218			(2,425	)		396,793
3.90% Senior Notes	2024		497,477			(2,733	)		494,744
3.95% Senior Notes	2025		499,295			(3,407	)		495,888
Total debt			2,534,335			(12,330	)		2,522,005
Current portion of debt			-			-			-
Debt (less current portion)		$	2,534,335		$	(12,330	)	$	2,522,005
Fair value of debt *								$	2,565,041
		December 31, 2016
(in thousands)	Maturity	Gross			Debt Issuance Costs			Net Carrying Amount
Amended Revolving Credit Facility	2019 - 2020	$	475,000		$	-		$	475,000
Term Loan	2017		250,000			(68	)		249,932
2.75% Senior Notes	2019		498,979			(2,124	)		496,855
2.80% Senior Notes	2020		598,602			(3,378	)		595,224
3.50% Senior Notes	2022		399,040			(2,975	)		396,065
3.90% Senior Notes	2024		497,110			(3,133	)		493,977
3.95% Senior Notes	2025		499,200			(3,867	)		495,333
Total debt			3,217,931			(15,545	)		3,202,386
Current portion of debt			(250,000	)		68			(249,932	)
Debt (less current portion)		$	2,967,931		$	(15,477	)	$	2,952,454
Fair value of debt *								$	3,254,862
*The fair value of the Senior Notes was estimated using Level 2 inputs comprised of quoted prices in active markets, market indices and interest rate measurements for debt with similar remaining maturity.