Debt And Interest Expense (Tables)

12 Months Ended

Dec. 31, 2020

Debt Disclosure [Abstract]

Schedule of Debt [Table Text Block]

The following table summarizes information related to our Senior notes:

	Issuance Date	Maturity Date	Interest Rate		Principal
					As of December 31,
					2020		2019
					(in thousands except interest rates)
Senior notes due 2023	April 16, 2013	May 1, 2023	4.625	%	$	750,000	$	750,000
Senior notes due 2025	March 27, 2015	April 1, 2025	5.250	%	500,000		500,000
Senior notes due 2027	July 5, 2017	July 15, 2027	4.750	%	550,000		550,000
Unamortized issuance costs					(9,917)		(12,435)
Total senior notes					$	1,790,083	$	1,787,565

Schedule of Components of Interest Expense

The following table presents the components of the Company’s interest expense:

	Year Ended December 31,
	2020		2019		2018
	(In thousands)
Contractual interest on Senior Notes	$	87,063	$	87,063	$	87,063
Contractual interest on subordinated convertible debentures	—		—		20,015
Amortization of debt discount on the subordinated convertible debentures	—		—		4,236
Amortization of debt issuance costs and other interest expense	3,081		3,548		3,531
Total interest expense	$	90,144	$	90,611	$	114,845