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Fair Value Measurement (Tables)
 3 Months Ended
Mar. 31, 2017
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, 2017
   
Total
 
Level 1
 
Level 2
 
Level 3
Commodity contract derivatives
$
2,562

 
$
1,531

 
$
1,031

 
$
—

Convertible debt conversion liability
(27,272
)
 
—

 
(27,272
)
 
—

Contingent considerations for acquisitions
(43,177
)
 
—

 
—

 
(43,177
)
 
$
(67,887
)
 
$
1,531

 
$
(26,241
)
 
$
(43,177
)
   
As of December 31, 2016
   
Total
 
Level 1
 
Level 2
 
Level 3
Commodity contract derivatives
$
(2,239
)
 
$
(1,297
)
 
$
(942
)
 
$
—

Convertible debt conversion liability
(27,100
)
 
—

 
(27,100
)
 
—

Contingent considerations for acquisitions
(46,568
)
 
—

 
—

 
(46,568
)
   
$
(75,907
)
 
$
(1,297
)
 
$
(28,042
)
 
$
(46,568
)
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
 
2017
 
2016
Balance at beginning of period, January 1
$
46,568

 
$
41,712

Fair value of contingent consideration at measurement date
—

 
4,500

Change in estimates included in earnings
589

 
(15
)
Settlements
(3,980
)
 
(581
)
Balance at end of period, March 31
43,177

 
45,616
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, 2017
 
As of December 31, 2016
   
Asset (Liability)
Carrying
Amount
 
Fair Value
 
Asset (Liability)
Carrying
Amount
 
Fair Value
Financial liabilities:
   
 
   
 
   
 
   
Debt and lines of credit
$
(239,613
)
 
$
(230,900
)
 
$
(270,735
)
 
$
(264,267
)