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Fair Value Measurement and Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2019
Fair Value Disclosures [Abstract]  
Estimated Fair Values and Related Carrying Values of Financial Instruments
The estimated fair values and related carrying values of the Company’s financial instruments are as follows:
 
June 30, 2019
 
December 31, 2018
In thousands
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
4.375% Senior Notes
$
248,952

 
$
259,010

 
$
248,823

 
$
254,218

3.45% Senior Notes
$
748,396

 
$
737,123

 
$
748,282

 
$
675,075

Floating Rate Notes 2021
$
497,396

 
$
496,830

 
$
496,796

 
$
497,425

4.15% Senior Notes
$
743,638

 
$
792,390

 
$
742,957

 
$
729,350

4.7% Senior Notes
$
1,240,191

 
$
1,349,025

 
$
1,239,657

 
$
1,179,625