Fair Value Measurements (Details 1) (Commodity swap / forward, USD $) In Thousands, unless otherwise specified	Dec. 31, 2014		Mar. 31, 2014
Recurring | Quoted Price in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	$ 0		$ 0
Recurring | Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	(1,293)		(1,709)
Recurring | Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	0		0
Total Fair Value Measurement
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	(1,293)	[1]	(1,709)	[1]
Total Fair Value Measurement | Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Liability	$ (1,293)		$ (1,709)

[1] These financial instruments are required to be measured at fair value, and are based on inputs as described in the three-tier hierarchy that prioritizes inputs used in measuring fair value as of the reported date: