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Long-Term Debt (Tables)
 3 Months Ended
Mar. 31, 2021
Debt Disclosure [Abstract]  
Schedule of Long-term Debt Instruments [Table Text Block]
The following table summarizes the Company’s total outstanding balance on its revolving credit facility, Senior Secured Notes net of unamortized discount and deferred financing costs, and Senior Unsecured Notes, net of unamortized deferred financing costs, as of March 31, 2021, and December 31, 2020:
As of March 31, 2021As of December 31, 2020
(in thousands)
Revolving credit facility$135,000 $93,000 
Senior Secured Notes (1)
464,222 460,656 
Senior Unsecured Notes (1)
1,661,429 1,660,663 
Total$2,260,651 $2,214,319 
____________________________________________
(1)    Senior Secured Notes and Senior Unsecured Notes are defined below.
Schedule of Line of Credit Facilities [Table Text Block]
The following table presents the outstanding balance, total amount of letters of credit outstanding, and available borrowing capacity under the Credit Agreement as of April 21, 2021, March 31, 2021, and December 31, 2020:
As of April 21, 2021As of March 31, 2021As of December 31, 2020
(in thousands)
Revolving credit facility (1)
$76,500 $135,000 $93,000 
Letters of credit (2)
— — 42,000 
Available borrowing capacity1,023,500 965,000 965,000 
Total aggregate lender commitment amount$1,100,000 $1,100,000 $1,100,000 
____________________________________________
(1)    Unamortized deferred financing costs attributable to the revolving credit facility are presented as a component of the other noncurrent assets line item on the accompanying balance sheets and totaled $3.9 million and $4.3 million as of March 31, 2021, and December 31, 2020, respectively. These costs are being amortized over the term of the revolving credit facility on a straight-line basis.
(2)    Letters of credit outstanding reduce the amount available under the revolving credit facility on a dollar-for-dollar basis.
Schedule Of Long-term Debt Instruments, Senior Secured Notes [Table Text Block] Senior Secured Notes, net of unamortized discount and deferred financing costs, included within the Senior Notes, net line item on the accompanying balance sheets as of March 31, 2021, and December 31, 2020, consisted of the following:
As of March 31, 2021
Principal AmountUnamortized Debt DiscountUnamortized Deferred Financing CostsNet
(in thousands)
1.50% Senior Secured Convertible Notes due 2021
$65,485 $914 $87 $64,484 
10.0% Senior Secured Notes due 2025
446,675 36,085 10,852 399,738 
Total$512,160 $36,999 $10,939 $464,222 
As of December 31, 2020
Principal AmountUnamortized Debt DiscountUnamortized Deferred Financing CostsNet
(in thousands)
1.50% Senior Secured Convertible Notes due 2021
$65,485 $1,828 $175 $63,482 
10.0% Senior Secured Notes due 2025
446,675 37,943 11,558 397,174 
Total$512,160 $39,771 $11,733 $460,656 
Schedule Of Long-term Debt Instruments, Senior Unsecured Notes [Table Text Block] Senior Unsecured Notes, net of unamortized deferred financing costs, included within the Senior Notes, net line item on the accompanying balance sheets as of March 31, 2021, and December 31, 2020, consisted of the following:
As of March 31, 2021As of December 31, 2020
Principal AmountUnamortized Deferred Financing CostsPrincipal Amount, NetPrincipal AmountUnamortized Deferred Financing CostsPrincipal Amount, Net
(in thousands)
6.125% Senior Notes due 2022
$212,403 $743 $211,660 $212,403 $855 $211,548 
5.0% Senior Notes due 2024
277,034 1,448 275,586 277,034 1,576275,458 
5.625% Senior Notes due 2025
349,118 2,634 346,484 349,118 2,792346,326 
6.75% Senior Notes due 2026
419,235 3,795 415,440 419,235 3,970415,265 
6.625% Senior Notes due 2027
416,791 4,532 412,259 416,791 4,725412,066 
Total$1,674,581 $13,152 $1,661,429 $1,674,581 $13,918 $1,660,663