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Debt (Tables)
 9 Months Ended
Sep. 30, 2019
Debt Disclosure [Abstract]  
Long term debt and capital lease obligations
 
September 30, 2019
 
December 31, 2018
In thousands
Current
 
Non-Current
 
Current
 
Non-Current
2024 Senior Notes, net(1)
$
—

 
$
226,709

 
$
—

 
$
245,854

Revolving Credit Facility(2)
—

 
—

 
—

 
135,000

Finance lease obligations
21,939

 
50,072

 
24,937

 
53,035

 
$
21,939

 
$
276,781

 
$
24,937

 
$
433,889


(1) Net of unamortized debt issuance costs of $3.3 million and $4.1 million at September 30, 2019 and December 31, 2018, respectively.
(2) Unamortized debt issuance costs of $2.5 million and $2.2 million at September 30, 2019 and December 31, 2018, respectively, included in Other Non-Current Assets.
Interest expenses incurred for various debt instruments
Interest Expense
 
Three months ended September 30,
 
Nine months ended September 30,
In thousands
2019
 
2018
 
2019
 
2018
2024 Senior Notes
$
3,563

 
$
3,672

 
$
10,907

 
$
11,016

Revolving Credit Facility
963

 
1,515

 
4,769

 
4,035

Finance lease obligations
1,210

 
512

 
3,459

 
1,551

Amortization of debt issuance costs
378

 
323

 
1,110

 
972

Accretion of Silvertip contingent consideration
182

 
329

 
541

 
980

Other debt obligations
58

 
196

 
60


312

Capitalized interest
(374
)
 
(729
)
 
(1,587
)
 
(1,065
)
Total interest expense, net of capitalized interest
$
5,980

 
$
5,818

 
$
19,259

 
$
17,801