Long-Term Debt (Tables)

3 Months Ended

Mar. 31, 2019

Debt Disclosure [Abstract]

Schedule of Long-Term Debt

Long-term debt includes the following:

	March 31, 2019			March 31, 2018			December 31, 2018
	(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 2023	250,000			250,000			250,000
2014 Senior Notes due May 2019	—			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			1,500,000
Debt issuance costs and debt discount	(46,546		)	(28,229		)	(48,277		)
	2,853,454			2,871,771			2,851,723
Less: current portion	—			—			—
Total long-term debt	$	2,853,454		$	2,871,771		$	2,851,723