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

 
$
245,471

 
$
—

 
$
245,088

Revolving Credit Facility(2)
—

 
115,000

 
—

 
100,000

Capital lease obligations
21,745

 
37,503

 
16,559

 
35,481

Silvertip debt obligation
—

 
—

 
14,194

 
—

 
$
21,745

 
$
397,974

 
$
30,753

 
$
380,569


(1) Net of unamortized debt issuance costs of $4.5 million and $4.9 million at June 30, 2018 and December 31, 2017, respectively.
(2) Unamortized debt issuance costs of $1.7 million and $1.9 million at June 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 June 30,
 
Six months ended June 30,
In thousands
2018
 
2017
 
2018
 
2017
2024 Senior Notes
$
3,672

 
$
1,265

 
$
7,344

 
$
1,265

2021 Senior Notes
—

 
2,717

 
—

 
6,221

Revolving Credit Facility
1,369

 
—

 
2,521

 
—

Capital lease obligations
515

 
383

 
1,039

 
689

Amortization of debt issuance costs
324

 
172

 
649

 
338

Accretion of debt premium
—

 
(28
)
 
—

 
(71
)
Accretion of Silvertip contingent consideration
327

 
—

 
651

 
—

Other debt obligations
6

 
9

 
114


18

Capitalized interest
(195
)
 
(774
)
 
(335
)
 
(1,137
)
Total interest expense, net of capitalized interest
$
6,018

 
$
3,744

 
$
11,983

 
$
7,323