XML 38 R25.htm IDEA: XBRL DOCUMENT v3.7.0.1
Debt (Tables)
 6 Months Ended
Jun. 30, 2017
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
 
2017
 
2016
 
2016
Gross long-term debt
 
$
726,700

 
$
601,700

 
$
726,700

Unamortized debt issuance costs
 
(6,591
)
 
(6,668
)
 
(7,377
)
Carrying amount
 
$
720,109

 
$
595,032

 
$
719,323

Estimated fair value(1)
 
791,885

 
708,322

 
793,339


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