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Long-Term Debt (Tables)
 9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Summary of Maturity Dates, Semi-Annual Interest Payment Dates, and Optional Redemption Periods of Outstanding Senior Note Obligations
The following table summarizes the face values, maturity dates, semi-annual interest payment dates, and optional redemption periods related to the Company’s outstanding senior note obligations at September 30, 2018. 
 
 
2022 Notes (1)
 
2023 Notes
 
2024 Notes
 
2028 Notes
 
2044 Notes
Face value (in thousands)
 
$1,600,000
 
$1,500,000
 
$1,000,000
 
$1,000,000
 
$700,000
Maturity date
  
Sep 15, 2022
 
April 15, 2023
 
June 1, 2024
 
January 15, 2028
 
June 1, 2044
Interest payment dates
  
March 15, Sep 15
 
April 15, Oct 15
 
June 1, Dec 1
 
Jan 15, July 15
 
June 1, Dec 1
Make-whole redemption period (2)
  
—
 
Jan 15, 2023
 
Mar 1, 2024
 
Oct 15, 2027
 
Dec 1, 2043
(1)
The Company has the option to redeem all or a portion of its remaining 2022 Notes at the decreasing redemption prices specified in the indenture related to the 2022 Notes plus any accrued and unpaid interest to the date of redemption.
(2)
At any time prior to the indicated dates, the Company has the option to redeem all or a portion of its senior notes of the applicable series at the “make-whole” redemption prices or amounts specified in the respective senior note indentures plus any accrued and unpaid interest to the date of redemption. On or after the indicated dates, the Company may redeem all or a portion of its senior notes at a redemption price equal to 100% of the principal amount of the senior notes being redeemed plus any accrued and unpaid interest to the date of redemption.
Schedule of Long-term Debt Instruments [Table Text Block]
Long-term debt, net of unamortized discounts, premiums, and debt issuance costs totaling $40.6 million and $44.3 million at September 30, 2018 and December 31, 2017, respectively, consists of the following.
In thousands
 
September 30, 2018
 
December 31, 2017
Revolving credit facility
 
$
190,000

 
$
188,000

Note payable
 
8,275

 
9,974

5% Senior Notes due 2022
 
1,598,313

 
1,997,576

4.5% Senior Notes due 2023
 
1,488,378

 
1,486,690

3.8% Senior Notes due 2024
 
992,868

 
992,036

4.375% Senior Notes due 2028
 
988,358

 
988,061

4.9% Senior Notes due 2044
 
691,475

 
691,354

Total debt
 
$
5,957,667

 
$
6,353,691

Less: Current portion of long-term debt
 
2,341

 
2,286

Long-term debt, net of current portion
 
$
5,955,326

 
$
6,351,405