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Fair Value Measurement (Tables)
 12 Months Ended
Dec. 31, 2019
Fair Value Disclosures [Abstract]  
Assets (liabilities) measured at fair value
A summary of assets (liabilities) measured at fair value, excluding assets held for sale, is as follows:
 
As of December 31, 2019
 
Total
 
Level 1
 
Level 2
 
Level 3
Commodity contract derivatives
$
(3,116
)
 
$
(84
)
 
$
(3,032
)
 
$
—


 
As of December 31, 2018
 
Total
 
Level 1
 
Level 2
 
Level 3
Commercial paper
$
22,872

 
$
—

 
$
22,872

 
$
—

Corporate bonds
$
28,060

 
—

 
28,060

 
—

Commodity contract derivatives
$
10,044

 
499

 
9,545

 
—

Contingent consideration for acquisitions
$
(9,861
)
 
—

 
—

 
(9,861
)
 
$
51,115

 
$
499

 
$
60,477

 
$
(9,861
)
Liabilities measured at fair value on a recurring basis
The following is a reconciliation of the beginning and ending balances for liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3):
 
Contingent Consideration for Acquisitions
 
2019
 
2018
Balance at beginning of period, January 1
$
9,861

 
$
20,485

Fair value of contingent consideration at measurement date
—

 
482

Change in estimates included in earnings
566

 
1,117

Settlements
(10,427
)
 
(12,223
)
Balance at end of period, December 31
$
—

 
$
9,861
Estimated fair values of the Company's financial instruments
The estimated fair values of the Company’s financial instruments, which are not recorded at fair value are as follows as of December 31:
 
2019
 
2018
 
Asset (Liability)
Carrying Amount
 
Estimated Fair Value
 
Asset (Liability)
Carrying Amount
 
Estimated Fair Value
Financial Liabilities:
 
 
 
 
 
 
 
Debt and lines of credit
$
(183,034
)
 
$
(338,482
)
 
$
(200,067
)
 
$
(410,564
)