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Debt (Tables)
 3 Months Ended
Mar. 31, 2018
Debt Disclosure [Abstract]  
Schedule of Future Minimum Lease Payments for Operating and Capital Leases [Table Text Block] [Table Text Block]
Long term debt and capital lease obligations
 
March 31, 2018
 
December 31, 2017
In thousands
Current
 
Non-Current
 
Current
 
Non-Current
2024 Senior Notes, net(1)
$
—

 
$
245,280

 
$
—

 
$
245,088

Revolving Credit Facility(2)
—

 
115,000

 
—

 
100,000

Capital lease obligations
17,040

 
36,704

 
16,559

 
35,481

Silvertip debt obligation
—

 
—

 
14,194

 
—

 
$
17,040

 
$
396,984

 
$
30,753

 
$
380,569


(1) Net of unamortized debt issuance costs of $4.7 million and $4.9 million at March 31, 2018 and December 31, 2017, respectively.
(2) Unamortized debt issuance costs of $1.8 million and $1.9 million at March 31, 2018 and December 31, 2017, respectively, included in Other Non-Current Assets.
Interest expenses incurred for various debt instruments
Interest Expense
 
Three months ended March 31,
In thousands
2018
 
2017
2024 Senior Notes
$
3,673

 
$
—

2021 Senior Notes
—

 
3,504

Revolving Credit Facility
1,152

 
—

Capital lease obligations
524

 
306

Amortization of debt issuance costs
325

 
166

Accretion of debt premium
—

 
(43
)
Accretion of Silvertip contingent consideration
324

 
—

Other debt obligations
107


9

Capitalized interest
(140
)
 
(363
)
Total interest expense, net of capitalized interest
$
5,965

 
$
3,579