Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Fair Value Assumptions, Convertible Notes

The main inputs and assumptions into the fair value model for the Convertible Notes at September 30, 2014 were as follows:

Company's stock price at the end of the period	$	8.54
Expected volatility	45.3		%
Credit spreads	14.41		%
Risk-free interest rate	1.14		%

Measurement of assets and liabilities at fair value on a recurring basis

The liabilities measured at fair value on a recurring basis were as follows:

	Level 1		Level 2		Level 3		Total
As of September 30, 2014
Derivative liability for commodity hedges	$	—	$	1,537	$	—	$	1,537
As of December 31, 2013
Derivative liability for commodity hedges	$	—	$	2,871	$	—	$	2,871