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Debt (Tables)
 9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]  
Long term debt and capital lease obligations
 
September 30, 2018
 
December 31, 2017
In thousands
Current
 
Non-Current
 
Current
 
Non-Current
2024 Senior Notes, net(1)
$
—

 
$
245,662

 
$
—

 
$
245,088

Revolving Credit Facility(2)
—

 
120,000

 
—

 
100,000

Capital lease obligations
22,696

 
40,832

 
16,559

 
35,481

Silvertip debt obligation
—

 
—

 
14,194

 
—

 
$
22,696

 
$
406,494

 
$
30,753

 
$
380,569


(1) Net of unamortized debt issuance costs of $4.3 million and $4.9 million at September 30, 2018 and December 31, 2017, respectively.
(2) Unamortized debt issuance costs of $1.5 million and $1.9 million at September 30, 2018 and December 31, 2017, 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
2018
 
2017
 
2018
 
2017
2024 Senior Notes
$
3,672

 
$
3,672

 
$
11,016

 
$
4,937

2021 Senior Notes
—

 
—

 
—

 
6,221

Revolving Credit Facility
1,515

 
—

 
4,035

 
—

Capital lease obligations
512

 
402

 
1,551

 
1,092

Amortization of debt issuance costs
323

 
180

 
972

 
518

Accretion of debt premium
—

 
—

 
—

 
(71
)
Accretion of Silvertip contingent consideration
329

 
—

 
980

 
—

Other debt obligations
196

 
13

 
312


30

Capitalized interest
(729
)
 
(672
)
 
(1,065
)
 
(1,809
)
Total interest expense, net of capitalized interest
$
5,818

 
$
3,595

 
$
17,801

 
$
10,918