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Debt (Tables)
 12 Months Ended
Dec. 31, 2019
Debt Disclosure [Abstract]  
Long term debt and capital lease obligations
 
December 31, 2019
 
December 31, 2018
In thousands
Current
 
Non-Current
 
Current
 
Non-Current
2024 Senior Notes, net(1)
$
—

 
$
226,885

 
$
—

 
$
245,854

Revolving Credit Facility(2)
—

 
—

 
—

 
135,000

Finance lease obligations
22,746

 
45,866

 
24,937

 
53,035

 
$
22,746

 
$
272,751

 
$
24,937

 
$
433,889


(1) Net of unamortized debt issuance costs of $3.1 million and $4.1 million at December 31, 2019 and December 31, 2018, respectively.
(2) Unamortized debt issuance costs of $2.3 million and $2.2 million at December 31, 2019 and December 31, 2018, respectively, included in Other Non-Current Assets.
Interest expenses incurred for various debt instruments ed to finance leasing arrangements.
Interest Expense
 
Year ended December 31,
In thousands
2019
 
2018
 
2017
2024 Senior Notes
$
14,586

 
$
14,688

 
$
8,608

2021 Senior Notes
—

 
—

 
6,221

Revolving Credit Facility
5,358

 
5,854

 
885

Finance lease obligations
4,150

 
2,270

 
1,621

Amortization of debt issuance costs
1,491

 
1,302

 
809

Accretion of Silvertip contingent consideration
396

 
1,311

 
260

Other debt obligations
580


176

 
(29
)
Capitalized interest
(1,790
)
 
(1,237
)
 
(1,935
)
Total interest expense, net of capitalized interest
$
24,771

 
$
24,364

 
$
16,440