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Fair Value Measurement (Tables)
 9 Months Ended
Sep. 30, 2015
Fair Value Disclosures [Abstract]  
Assets (Liabilities) Measured at Fair Value
A summary of assets (liabilities) measured at fair value is as follows:
   
As of September 30, 2015
   
Total
 
Level 1
 
Level 2
 
Level 3
Money market funds
$
5,002

 
$
5,002

 
$
—

 
$
—

Commercial paper
2,998

 
—

 
2,998

 
—

Commercial notes/bonds
4,033

 
—

 
4,033

 
—

Commodity contract derivatives
2,319

 
441

 
1,878

 
—

Contingent consideration for LS9 acquisition
(7,258
)
 
—

 
—

 
(7,258
)
Contingent consideration for Dynamic Fuels acquisition
(29,233
)
 
—

 
—

 
(29,233
)
Contingent consideration for Imperium Renewables, Inc. acquisition
(5,000
)
 
—

 
—

 
(5,000
)
 
$
(27,139
)
 
$
5,443

 
$
8,909

 
$
(41,491
)
   
As of December 31, 2014
   
Total
 
Level 1
 
Level 2
 
Level 3
Money market funds
$
302

 
$
302

 
$
—

 
$
—

Certificates of deposit
9,995

 
—

 
9,995

 
—

Commercial notes/bond
6,775

 
—

 
6,775

 
—

Commodity contract derivatives
14,696

 
6,885

 
7,811

 
—

Contingent consideration for LS9 acquisition
(8,624
)
 
—

 
—

 
(8,624
)
Contingent consideration of Dynamic Fuels acquisition
(30,695
)
 
—

 
—

 
(30,695
)
   
$
(7,551
)
 
$
7,187

 
$
24,581

 
$
(39,319
)
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 LS9 Acquisition
 
Contingent Consideration for Dynamic Fuels Acquisition
 
Contingent Consideration for Imperium Acquisition
Balance at beginning of period, January 1, 2015
$
8,624

 
$
30,695

 
$
—

Change in estimates included in earnings
(31
)
 
324

 
—

Settlements
—

 
(1,052
)
 
—

Balance at end of period, March 31, 2015
8,593

 
29,967

 
—

Change in estimates included in earnings
(2,434
)
 
313

 
—

Settlements
—

 
(943
)
 
—

Balance at end of period, June 30, 2015
6,159

 
29,337

 
—

Fair value of contingent consideration at measurement date
—

 
—

 
5,000

Change in estimates included in earnings
1,099

 
7

 
—

Settlements
—

 
(111
)
 
—

Balance at end of period, September 30, 2015
$
7,258

 
$
29,233

 
$
5,000


 
Contingent Consideration for LS9 Acquisition
 
Contingent Consideration for Dynamic Fuels Acquisition
Balance at beginning of period, January 1, 2014
$
—

 
$
—

Fair value of contingent consideration at measurement date
17,050

 
—

Balance at end of period, March 31, 2014
17,050

 
—

Fair value of contingent consideration at measurement date
—

 
28,900

Change in estimates included in earnings
(384
)
 
—

Settlements
—

 
—

Balance at end of period, June 30, 2014
16,666

 
28,900

Change in estimates included in earnings
(1,192
)
 
133

Settlements
—

 
—

Balance at end of period, September 30, 2014
$
15,474

 
$
29,033
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 September 30, 2015
 
As of December 31, 2014
   
Asset (Liability)
Carrying
Amount
 
Fair Value
 
Asset (Liability)
Carrying
Amount
 
Fair Value
Financial liabilities:
   
 
   
 
   
 
   
Debt and lines of credit
$
(279,365
)
 
$
(277,059
)
 
$
(269,608
)
 
$
(270,331
)