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Fair Value of Financial Instruments (Tables)
12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Fair Value, Assets Measured on Recurring Basis
The financial instrument measured at fair value on a recurring basis is summarized below:
 
Fair Value Measurements at
December 31, 2019
 
Fair Value Measurements at
December 31, 2018
Description
Level 1
 
Level 2
 
Level 3
 
Level 1
 
Level 2
 
Level 3
Gas Derivatives
$

 
$
405,781

 
$

 
$

 
$
99,456

 
$


Fair Value, by Balance Sheet Grouping
The carrying amounts and fair values of financial instruments for which the fair value option was not elected are as follows:
 
December 31, 2019
 
December 31, 2018
 
Carrying
Amount
 
Fair
Value
 
Carrying
Amount
 
Fair
Value
Cash and Cash Equivalents
$
16,283

 
$
16,283

 
$
17,198

 
$
17,198

Long-Term Debt (Excluding Debt Issuance Costs)
$
2,763,433

 
$
2,619,676

 
$
2,387,001

 
$
2,290,537