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Debt (Tables)
 9 Months Ended
Sep. 30, 2021
Debt Disclosure [Abstract]  
Long term debt and capital lease obligations
 September 30, 2021December 31, 2020
In thousandsCurrentNon-CurrentCurrentNon-Current
2029 Senior Notes, net(1)
$— $368,038 $— $— 
2024 Senior Notes, net(2)
— — — 227,590 
Revolving Credit Facility(3)
— 20,000 — — 
Finance lease obligations31,384 23,004 22,074 25,837 
$31,384 $411,042 $22,074 $253,427 
(1) Net of unamortized debt issuance costs of $7.0 million and $0.0 million at September 30, 2021 and December 31, 2020, respectively.
(2) Net of unamortized debt issuance costs of $0.0 million and $2.4 million at September 30, 2021 and December 31, 2020, respectively.
(3) Unamortized debt issuance costs of $2.5 million and $1.5 million at September 30, 2021 and December 31, 2020, respectively, included in Other Non-Current Assets.
Interest Expenses Incurred for Various Debt Instruments [Table Text Block]
Interest Expense
 Three Months Ended September 30,Nine Months Ended September 30,
In thousands2021202020212020
2024 Senior Notes$— $3,378 $2,591 $10,134 
2029 Senior Notes4,805 — 11,211 — 
Revolving Credit Facility508 767 1,438 2,520 
Finance lease obligations1,833 927 3,441 2,852 
Amortization of debt issuance costs415 372 1,306 1,143 
Other debt obligations51 45 225 261 
Capitalized interest(4,375)(393)(6,972)(921)
Total interest expense, net of capitalized interest$3,237 $5,096 $13,240 $15,989