Debt (Tables)

12 Months Ended

Dec. 31, 2021

Debt Disclosure [Abstract]

Long term debt and capital lease obligations

	December 31, 2021				December 31, 2020
In thousands	Current		Non-Current		Current		Non-Current
2029 Senior Notes, net(1)	$	—	$	368,273	$	—	$	—
2024 Senior Notes, net(2)	—		—		—		227,590
Revolving Credit Facility(3)	—		65,000		—		—
Finance lease obligations	29,821		24,407		22,074		25,837
	$	29,821	$	457,680	$	22,074	$	253,427

(1) Net of unamortized debt issuance costs of $6.7 million and $0.0 million at December 31, 2021 and December 31, 2020, respectively.

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

(3) Unamortized debt issuance costs of $2.4 million and $1.5 million at December 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

	Year Ended December 31,
In thousands	2021		2020		2019
2024 Senior Notes	$	2,591	$	13,513	$	14,586
2029 Senior Notes	16,016		—		—
Revolving Credit Facility	2,296		3,165		5,358
Finance lease obligations	4,632		3,634		4,150
Amortization of debt issuance costs	1,726		1,525		1,491
Accretion of Silvertip contingent consideration	—		—		396
Other debt obligations	303		344		580
Capitalized interest	(11,113)		(1,473)		(1,790)
Total interest expense, net of capitalized interest	$	16,451	$	20,708	$	24,771