Long-Term Debt (Tables)

9 Months Ended

Sep. 30, 2018

Debt Disclosure [Abstract]

Schedule of Long-Term Debt

Long-term debt includes the following:

	September 30, 2018			September 30, 2017			December 31, 2017
	(In thousands)
2010 Senior Notes due October 2020 and October 2040	$	500,000		$	500,000		$	500,000
2011 Senior Notes due November 2041	300,000			300,000			300,000
2013 Senior Notes due March 2018 and March 2023	250,000			500,000			500,000
2014 Senior Notes due May 2019	—			500,000			500,000
2016 Senior Notes due August 2021	350,000			350,000			350,000
2017/2018 Senior Notes due December 2025	1,500,000			—			1,000,000
Debt issuance costs and debt discount	(50,078		)	(13,596		)	(26,881		)
	2,849,922			2,136,404			3,123,119
Less: current portion	—			(250,000		)	(250,000		)
Total long-term debt	$	2,849,922		$	1,886,404		$	2,873,119