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Debt (Tables)
 6 Months Ended
Jun. 30, 2018
Debt Disclosure [Abstract]  
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments
The following table provides an estimate of the fair value of our long-term debt, including current maturities of long-term debt, using market prices in effect on the valuation date:
 
 
June 30,
 
December 31,
In thousands
 
2018
 
2017
 
2017
Gross long-term debt
 
$
764,700

 
$
726,700

 
$
786,700

Unamortized debt issuance costs
 
(6,020
)
 
(6,591
)
 
(6,813
)
Carrying amount
 
$
758,680

 
$
720,109

 
$
779,887

Estimated fair value(1)
 
$
792,623

 
$
791,885

 
$
853,339


(1) Estimated fair value does not include unamortized debt issuance costs.