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Fair Value (Tables)
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
Fair Value of Derivatives
The fair value of our derivative financial instruments by level is as follows:
 
 
Fair Value at
 
Fair Value at
Asset / (Liability
(dollars in thousands)
 
December 31, 2018
 
December 31, 2017
 
Level 1
 
Level 2
 
Level 3
 
Total
 
Level 1
 
Level 2
 
Level 3
 
Total
Commodity futures natural gas contracts
 
$

 
$
265

 
$

 
$
265

 
$

 
$
(503
)
 
$

 
$
(503
)
Interest rate swaps
 

 
(4,288
)
 

 
(4,288
)
 

 
433

 

 
433

Net derivative asset (liability)
 
$

 
$
(4,023
)
 
$

 
$
(4,023
)
 
$

 
$
(70
)
 
$

 
$
(70
)
Schedule of Carrying Values and Estimated Fair Values of Debt Instruments [Table Text Block]
Financial instruments carried at cost on the Consolidated Balance Sheets, as well as the related fair values, are as follows:
 
 
 
 
December 31, 2018
 
December 31, 2017
(dollars in thousands)
 
Fair Value
Hierarchy Level
 
Carrying Amount
 
Fair Value
 
Carrying Amount
 
Fair Value
Term Loan B
 
Level 2
 
$
380,200

 
$
362,141

 
$
384,600

 
$
370,178