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Long-Term Debt
 6 Months Ended
Jun. 30, 2020
Debt Disclosure [Abstract]  
Long-Term Debt Long-Term Debt
Long-term debt includes the following:
June 30,
2020		June 30,
2019		December 31,
2019
 (In thousands)
2010 Senior Notes due October 2020$—  $250,000  $—  
2010 Senior Notes due October 2040250,000  250,000  250,000  
2011 Senior Notes due November 2041300,000  300,000  300,000  
2013 Senior Notes due March 2023250,000  250,000  250,000  
2016 Senior Notes due August 2021—  350,000  —  
2017/2018 Senior Notes due December 20251,500,000  1,500,000  1,500,000  
2019 Senior Notes due December 2027600,000  —  600,000  
Debt issuance costs and debt discount(49,159) (44,806) (53,249) 
$2,850,841  $2,855,194  $2,846,751