The following table provides an estimate of the fair value of long-term debt, including current maturities of long-term debt, using market prices in effect on the valuation date:



	September 30,						December 31,
In thousands	2018			2017			2017
Gross long-term debt	$	815,534		$	786,700		$	786,700
Unamortized debt issuance costs	(5,940		)	(7,276		)	(6,813		)
Carrying amount	$	809,594		$	779,424		$	779,887
Estimated fair value⁽¹⁾	$	833,962		$	847,068		$	853,339

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