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Fair Value of Financial Instruments (Tables)
 6 Months Ended
Jun. 30, 2017
Fair Value Disclosures [Abstract]  
Carrying Amount and Estimated Fair Value of Financial Instruments
The following tables present the carrying amount and estimated fair value of our financial instruments recognized at fair value on a recurring basis:
 
 
June 30, 2017
 
 
Estimated Fair Value Measurements
 
 
Carrying Amount
 
Quoted Prices in Active Markets (Level 1)
 
Significant Other Observable Inputs(Level 2)
 
Significant Unobservable Inputs (Level 3)
Assets -
 
 
 
 
 
 
 
 
Marketable securities
 
$
7,077

 
$
7,077

 
$
—

 
$
—

Foreign currency forward contracts
 
$
739

 
$
—

 
$
739

 
$
—

 
 
December 31, 2016
 
 
Estimated Fair Value Measurements
 
 
Carrying Amount
 
Quoted Prices in Active Markets(Level 1)
 
Significant Other Observable Inputs(Level 2)
 
Significant Unobservable Inputs (Level 3)
Assets -
 
 
 
 
 
 
 
 
Marketable securities
 
$
6,246

 
$
6,246

 
$
—

 
$
—

FCX Settlement
 
$
14,400

 
$
—

 
$
—

 
$
14,400
Schedule of Activity Related to FCX Settlement Asset
The following table details the activity related to the FCX Settlement asset classified within Level 3 of the valuation hierarchy for the periods indicated:
Balance as of December 31, 2016
 
$
14,400

Fair value recognized in earnings
 
(7,900
)
Balance as of March 31, 2017
 
$
6,500

Fair value recognized in earnings
 
(6,500
)
Balance as of June 30, 2017
 
$
—