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

 
$
246,237

 
$
—

 
$
245,854

Revolving Credit Facility(2)
—

 
53,000

 
—

 
135,000

Finance lease obligations
21,772

 
48,968

 
24,937

 
53,035

 
$
21,772

 
$
348,205

 
$
24,937

 
$
433,889


(1) Net of unamortized debt issuance costs of $3.8 million and $4.1 million at June 30, 2019 and December 31, 2018, respectively.
(2) Unamortized debt issuance costs of $2.7 million and $2.2 million at June 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 June 30,
 
Six Months Ended June 30,
In thousands
2019
 
2018
 
2019
 
2018
2024 Senior Notes
$
3,671

 
$
3,672

 
$
7,344

 
$
7,344

Revolving Credit Facility
1,953

 
1,369

 
3,806

 
2,521

Finance lease obligations
1,142

 
515

 
2,249

 
1,039

Amortization of debt issuance costs
390

 
324

 
732

 
649

Accretion of Silvertip contingent consideration
180

 
327

 
359

 
651

Other debt obligations
2

 
6

 
2


114

Capitalized interest
(513
)
 
(195
)
 
(1,213
)
 
(335
)
Total interest expense, net of capitalized interest
$
6,825

 
$
6,018

 
$
13,279

 
$
11,983