Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2017

Fair Value Disclosures [Abstract]

Carrying Value and Fair Value of Long-Term Debt

The following table sets forth the carrying value and fair value of long-term debt as of December 31:

	2017				2016
In thousands	Carrying Value		Fair Value		Carrying Value		Fair Value
Variable rate debt	$	171,200	$	171,200	$	61,595	$	61,595
Fixed-rate bonds		250,000		253,823		250,000		256,563
2.40% Term loan		7,710		7,889		8,282		8,877
2.05% Term loan		33,607		34,122		35,163		37,089
1.30% Term Loan		9,423		9,370		9,788		10,062
1.55% Term loan		11,390		11,320		10,333		10,082
Total	$	483,330	$	487,724	$	375,161	$	384,268