Debt (Tables)

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Long term debt and capital lease obligations

	March 31, 2021				December 31, 2020
In thousands	Current		Non-Current		Current		Non-Current
2029 Senior Notes, net(1)	$	—	$	367,572	$	—	$	—
2024 Senior Notes, net(2)	—		—		—		227,590
Revolving Credit Facility(3)	—		—		—		—
Finance lease obligations	21,404		23,149		22,074		25,837
	$	21,404	$	390,721	$	22,074	$	253,427

(1) Net of unamortized debt issuance costs of $7.4 million and $0.0 million at March 31, 2021 and December 31, 2020, respectively.

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

(3) Unamortized debt issuance costs of $2.7 million and $1.5 million at March 31, 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 March 31,
In thousands	2021		2020
2024 Senior Notes	$	2,591	$	3,378
2029 Senior Notes	1,602		—
Revolving Credit Facility	480		549
Finance lease obligations	589		1,005
Amortization of debt issuance costs	404		381
Other debt obligations	57		35
Capitalized interest	(813)		(220)
Total interest expense, net of capitalized interest	$	4,910	$	5,128