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FAIR VALUE MEASUREMENTS
12 Months Ended
Dec. 31, 2018
Fair Value Disclosures [Abstract]  
FAIR VALUE MEASUREMENTS
FAIR VALUE MEASUREMENTS

The Company’s financial instruments are measured and reported at their estimated fair value. Fair value is the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction. When available, the Company uses quoted prices in active markets to determine the fair values for its financial instruments (Level 1 inputs), or absent quoted market prices, observable market-corroborated inputs over the term of the financial instruments (Level 2 inputs). The Company does not have any unobservable inputs that are not corroborated by market inputs (Level 3 inputs) except as stated in Notes 4 and 9.
The Company holds marketable securities associated with its Savings Plans, which are valued based on readily available quoted market prices. The Company also holds short-term investments which are classified as trading securities with any gains or losses recognized through earnings. The Company utilizes derivative instruments to manage its risk of changes in natural gas prices and its risk of changes in foreign currency exchange rates (see Note 11). The fair value of the natural gas derivative instruments and the foreign currency swaps are determined using market data of forward prices for all of the Company’s contracts. 
The estimated fair values for each type of instrument are presented below (in millions).
 
 
December 31, 2018
 
Level One
 
Level Two
 
Level Three
Asset Class:
 
 
 
 
 
 
 
 
Mutual fund investments in a non-qualified savings plan(a)
 
$
1.8

 
$
1.8

 
$

 
$

Derivatives - foreign currency swaps, net
 
4.5

 

 
4.5

 

Total Assets
 
$
6.3

 
$
1.8

 
$
4.5

 
$

Liability Class:
 
 

 
 

 
 

 
 

Liabilities related to non-qualified savings plan
 
$
(1.8
)
 
$
(1.8
)
 
$

 
$

Derivatives – natural gas instruments
 
(0.6
)
 

 
(0.6
)
 

Total Liabilities
 
$
(2.4
)
 
$
(1.8
)
 
$
(0.6
)
 
$


(a)
Includes mutual fund investments of approximately 25% in the common stock of large-cap U.S. companies, 15% in the common stock of small to mid-cap U.S. companies, 5% in the common stock of international companies, 20% in bond funds, 15% in short-term investments and 20% in blended funds.
 
 
December 31, 2017
 
Level One
 
Level Two
 
Level Three
Asset Class:
 
 
 
 
 
 
 
 
Mutual fund investments in a non-qualified savings plan(a)
 
$
2.2

 
$
2.2

 
$

 
$

Derivatives - foreign currency swaps, net
 
1.3

 

 
1.3

 

Total Assets
 
$
3.5

 
$
2.2

 
$
1.3

 
$

Liability Class:
 
 

 
 

 
 

 
 

Liabilities related to non-qualified savings plan
 
$
(2.2
)
 
$
(2.2
)
 
$

 
$

Derivatives - natural gas instruments
 
(1.4
)
 

 
(1.4
)
 

Total Liabilities
 
$
(3.6
)
 
$
(2.2
)
 
$
(1.4
)
 
$


(a)
Includes mutual fund investments of approximately 30% in the common stock of large-cap U.S. companies, 15% in the common stock of small to mid-cap U.S. companies, 5% in the common stock of international companies, 10% in bond funds, 20% in short-term investments and 20% in blended funds.

Cash and cash equivalents, accounts receivable (net of reserve for bad debts) and payables are carried at cost, which approximates fair value due to their liquid and short-term nature. The Company’s investments related to its nonqualified retirement plan of $1.8 million and $2.2 million as of December 31, 2018 and 2017, respectively, are stated at fair value based on quoted market prices. As of December 31, 2018 and 2017, the estimated fair value of the fixed-rate 4.875% Notes, based on available trading information (Level 2), totaled $226.3 million and $246.9 million, respectively, compared with the aggregate principal amount at maturity of $250.0 million. The fair value at December 31, 2018 and 2017 of amounts outstanding under the Credit Agreement, based upon available bid information received from the Company’s lender (Level 2), totaled approximately $1.02 billion and $989.5 million, respectively, compared with the aggregate principal amount at maturity of $1.03 billion and $1.01 billion, respectively.