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Fair Value Measurement and Fair Value of Financial Instruments (Q3) (Tables)
9 Months Ended 12 Months Ended
Sep. 30, 2018
Dec. 31, 2017
Fair Value Disclosures [Abstract]    
Liabilities Carried at Fair Value Measured on Recurring Basis
The following table provides the liabilities carried at fair value measured on a recurring basis as of September 30, 2018, which are included in other current liabilities on the Condensed Consolidated Balance sheet:
 
           
 
    
Fair Value Measurements at September 30, 2018 Using
 
In thousands
 
Total Carrying
Value at
September 30,
2018
  
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
  
Significant Other
Observable Inputs
(Level 2)
  
Significant
Unobservable
Inputs
(Level 3)
 
Interest rate swap agreements
 
$
87
  
$
  
$
87
  
$
 
Total
 
$
87
  
$
  
$
87
  
$
 
The following table provides the liabilities carried at fair value measured on a recurring basis as of December 31, 2017, which is included in other current liabilities on the Condensed Consolidated Balance sheet:
 
           
 
    
Fair Value Measurements at December 31, 2017 Using
 
In thousands
 
Total Carrying
Value at
December 31,
2017
  
Quoted Prices in
Active Markets for
Identical Assets
(Level 1)
  
Significant Other
Observable Inputs
(Level 2)
  
Significant
Unobservable
Inputs
(Level 3)
 
Interest rate swap agreements
 
$
1,163
  
$
  
$
1,163
  
$
 
Total
 
$
1,163
  
$
  
$
1,163
  
$
 
The following table provides the liabilities carried at fair value measured on a recurring basis as of December 31, 2017, which are included in other current liabilities on the Consolidated Balance sheet:
 
     
Fair Value Measurements at December 31, 2017 Using
 
  
Total Carrying
Value at
December 31,
  
Quoted Prices in
Active Markets for
Identical Assets
  
Significant Other
Observable Inputs
  
Significant
Unobservable
Inputs
 
In thousands
 
2017
  
(Level 1)
  
(Level 2)
  
(Level 3)
 
Interest rate swap agreements
  
1,163
   
   
1,163
   
 
Total          
 
$
1,163
  
$
  
$
1,163
  
$
 
 
The following table provides the liabilities carried at fair value measured on a recurring basis as of December 31, 2016, which are included in other current liabilities on the Consolidated Balance sheet:
 
     
Fair Value Measurements at December 31, 2016 Using
 
  
Total Carrying
Value at
December 31,
  
Quoted Prices in
Active Markets for
Identical Assets
  
Significant Other
Observable Inputs
  
Significant
Unobservable
Inputs
 
In thousands
 
2016
  
(Level 1)
  
(Level 2)
  
(Level 3)
 
Interest rate swap agreements
  
3,888
   
   
3,888
   
 
Total
 
$
3,888
  
$
  
$
3,888
  
$
 
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:
 
           
 
 
September 30, 2018
  
December 31, 2017
 
In thousands
 
Carrying
Value
  
Fair
Value
  
Carrying
Value
  
Fair
Value
 
Interest rate swap agreement
 
$
87
  
$
87
  
$
1,163
  
$
1,163
 
4.375% Senior Notes
  
248,759
   
254,408
   
248,567
   
262,033
 
3.45% Senior Notes
  
748,225
   
687,698
   
747,655
   
741,113
 
Floating Rate Notes 2021
  
496,495
   
501,065
   
   
 
4.15% Senior Notes
  
742,616
   
745,350
   
   
 
4.7% Senior Notes
  
1,239,417
   
1,232,300
   
   
 
The estimated fair values and related carrying values of the Company’s financial instruments are as follows:
 
   
December 31, 2017
  
December 31, 2016
 
   
Carry
  
Fair
  
Carry
  
Fair
 
 
In thousands
 
Value
  
Value
  
Value
  
Value
 
 
Interest rate swap agreements          
 
$
1,163
  
$
1,163
  
$
3,888
  
$
3,888
 
 
4.375% Senior Notes          
  
248,567
   
262,033
   
248,310
   
260,265
 
 
3.45% Senior Notes          
  
747,655
   
741,113
   
747,474
   
719,273