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Long-Term Debt (Tables)
9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Schedule of Credit Agreement 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 October 24, 2019, September 30, 2019, and December 31, 2018:
 
As of October 24, 2019
 
As of September 30, 2019
 
As of December 31, 2018
 
(in thousands)
Revolving credit facility (1)
$
143,000

 
$
129,000

 
$

Letters of credit (2)

 

 
200

Available borrowing capacity
1,057,000

 
1,071,000

 
999,800

Total aggregate lender commitment amount
$
1,200,000

 
$
1,200,000

 
$
1,000,000

____________________________________________
(1) 
Unamortized deferred financing costs attributable to the credit facility are presented as a component of the other noncurrent assets line item on the accompanying balance sheets and totaled $6.3 million and $6.4 million as of September 30, 2019, and December 31, 2018, respectively. These costs are being amortized over the term of the credit facility on a straight-line basis.
(2) 
Letters of credit outstanding reduce the amount available under the credit facility on a dollar-for-dollar basis. The letter of credit outstanding as of December 31, 2018, was released during the three months ended March 31, 2019.
Schedule of Senior Notes [Table Text Block] The Senior Notes, net of unamortized deferred financing costs line item on the accompanying balance sheets as of September 30, 2019, and December 31, 2018, consisted of the following:
 
As of September 30, 2019
 
As of December 31, 2018
 
Principal Amount
 
Unamortized Deferred Financing Costs
 
Principal Amount, Net of Unamortized Deferred Financing Costs
 
Principal Amount
 
Unamortized Deferred Financing Costs
 
Principal Amount, Net of Unamortized Deferred Financing Costs
 
(in thousands)
6.125% Senior Notes due 2022
$
476,796

 
$
3,170

 
$
473,626

 
$
476,796

 
$
3,921

 
$
472,875

5.0% Senior Notes due 2024
500,000

 
3,996

 
496,004

 
500,000

 
4,688

 
495,312

5.625% Senior Notes due 2025
500,000

 
5,130

 
494,870

 
500,000

 
5,808

 
494,192

6.75% Senior Notes due 2026
500,000

 
5,780

 
494,220

 
500,000

 
6,407

 
493,593

6.625% Senior Notes due 2027
500,000

 
6,834

 
493,166

 
500,000

 
7,533

 
492,467

Total
$
2,476,796

 
$
24,910

 
$
2,451,886

 
$
2,476,796

 
$
28,357

 
$
2,448,439


Schedule of Senior Convertible Notes [Table Text Block] The Senior Convertible Notes, net of unamortized discount and deferred financing costs line on the accompanying balance sheets as of September 30, 2019, and December 31, 2018, consisted of the following:
 
As of September 30, 2019
 
As of December 31, 2018
 
(in thousands)
Principal amount of Senior Convertible Notes
$
172,500

 
$
172,500

Unamortized debt discount
(16,012
)
 
(22,313
)
Unamortized deferred financing costs
(1,605
)
 
(2,293
)
Senior Convertible Notes, net of unamortized discount and deferred financing costs
$
154,883

 
$
147,894