Debt (Tables)

6 Months Ended

Jun. 30, 2021

Debt Disclosure [Abstract]

Long term debt and capital lease obligations

	June 30, 2021				December 31, 2020
In thousands	Current		Non-Current		Current		Non-Current
2029 Senior Notes, net(1)	$	—	$	367,804	$	—	$	—
2024 Senior Notes, net(2)	—		—		—		227,590
Revolving Credit Facility(3)	—		—		—		—
Finance lease obligations	28,876		17,566		22,074		25,837
	$	28,876	$	385,370	$	22,074	$	253,427

(1) Net of unamortized debt issuance costs of $7.2 million and $0.0 million at June 30, 2021 and December 31, 2020, respectively.

(2) Net of unamortized debt issuance costs of $0.0 million and $2.4 million at June 30, 2021 and December 31, 2020, respectively.

(3) Unamortized debt issuance costs of $2.7 million and $1.5 million at June 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 June 30,				Six Months Ended June 30,
In thousands	2021		2020		2021		2020
2024 Senior Notes	$	—	$	3,378	$	2,591	$	6,756
2029 Senior Notes	4,804		—		6,406		—
Revolving Credit Facility	450		1,204		930		1,753
Finance lease obligations	1,018		920		1,607		1,925
Amortization of debt issuance costs	487		390		891		771
Other debt obligations	118		181		175		216
Capitalized interest	(1,784)		(308)		(2,597)		(528)
Total interest expense, net of capitalized interest	$	5,093	$	5,765	$	10,003	$	10,893