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Fair Value Measurement (Tables)
 3 Months Ended
Mar. 31, 2016
Fair Value Disclosures [Abstract]  
Assets (Liabilities) Measured at Fair Value
A summary of assets (liabilities) measured at fair value is as follows:
   
As of March 31, 2016
   
Total
 
Level 1
 
Level 2
 
Level 3
Commodity contract derivatives
$
(4,513
)
 
$
(3,350
)
 
$
(1,163
)
 
$
—

Contingent considerations for acquisitions
(45,616
)
 
—

 
—

 
(45,616
)
 
$
(50,129
)
 
$
(3,350
)
 
$
(1,163
)
 
$
(45,616
)
   
As of December 31, 2015
   
Total
 
Level 1
 
Level 2
 
Level 3
Commodity contract derivatives
$
4,459

 
$
2,196

 
$
2,263

 
$
—

Contingent considerations for acquisitions
(41,712
)
 
—

 
—

 
(41,712
)
   
$
(37,253
)
 
$
2,196

 
$
2,263

 
$
(41,712
)
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
 
 
March 31, 2016
 
March 31, 2015
Balance at beginning of period
 
$
41,712

 
$
39,319

Fair value of contingent consideration at measurement date
 
4,500

 
—

Change in estimates included in earnings
 
(15
)
 
293

Settlements
 
(581
)
 
(1,052
)
Balance at end of period
 
$
45,616

 
$
38,560
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 March 31, 2016
 
As of December 31, 2015
   
Asset (Liability)
Carrying
Amount
 
Fair Value
 
Asset (Liability)
Carrying
Amount
 
Fair Value
Financial liabilities:
   
 
   
 
   
 
   
Debt and lines of credit
$
(263,127
)
 
$
(262,664
)
 
$
(279,711
)
 
$
(275,123
)