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Fair Value Measurement (Tables)
 6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Assets (Liabilities) Measured at Fair Value
A summary of assets (liabilities) measured at fair value is as follows:
   
As of June 30, 2018
   
Total
 
Level 1
 
Level 2
 
Level 3
Commodity contract derivatives
$
1,502

 
$
10

 
$
1,492

 
$
—

Contingent considerations for acquisitions
(20,065
)
 
—

 
—

 
(20,065
)
 
$
(18,563
)
 
$
10

 
$
1,492

 
$
(20,065
)
   
As of December 31, 2017
   
Total
 
Level 1
 
Level 2
 
Level 3
Commodity contract derivatives
$
(7,189
)
 
$
(3,742
)
 
$
(3,447
)
 
$
—

Contingent considerations for acquisitions
(34,393
)
 
—

 
—

 
(34,393
)
   
$
(41,582
)
 
$
(3,742
)
 
$
(3,447
)
 
$
(34,393
)
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
 
2018
 
2017
Balance at beginning of period, January 1
$
34,393

 
$
46,568

Change in estimates included in earnings
(1,540
)
 
589

Settlements
(2,813
)
 
(3,980
)
Balance at end of period, March 31
30,040

 
43,177

Change in estimates included in earnings
(7,129
)
 
(24
)
Settlements
(2,846
)
 
(3,698
)
Balance at end of period, June 30
$
20,065

 
$
39,455
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 June 30, 2018
 
As of December 31, 2017
   
Asset (Liability)
Carrying
Amount
 
Fair Value
 
Asset (Liability)
Carrying
Amount
 
Fair Value
Financial liabilities:
   
 
   
 
   
 
   
Debt and lines of credit
$
(220,188
)
 
$
(412,214
)
 
$
(294,085
)
 
$
(273,983
)