Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2017

Debt Disclosure [Abstract]

Long-Term Debt

Long-term debt includes the following:

	March 31, 2017			March 31, 2016			December 31, 2016
	(In thousands)
2010 Senior Notes due October 2020 and October 2040	$	500,000		$	500,000		$	500,000
2011 Senior Notes due November 2016 and November 2041	300,000			600,000			300,000
2013 Senior Notes due March 2018 and March 2023	500,000			500,000			500,000
2014 Senior Notes due May 2019	500,000			500,000			500,000
2016 Senior Notes due August 2021	350,000			—			350,000
Debt issuance costs	(15,018		)	(14,573		)	(15,729		)
	2,134,982			2,085,427			2,134,271
Less: current portion	(250,000		)	(300,000		)	—
Total long-term debt	$	1,884,982		$	1,785,427		$	2,134,271