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Fair Value Measurements - Financial Assets and Financial Liabilities That are Measured at Fair Value on a Recurring Basis (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Sep. 30, 2013	Mar. 31, 2013	Dec. 31, 2013 Commodity contracts Fair Value, Measurements, Recurring	Sep. 30, 2013 Commodity contracts Fair Value, Measurements, Recurring	Dec. 31, 2012 Commodity contracts Fair Value, Measurements, Recurring	Dec. 31, 2013 Commodity contracts Fair Value, Measurements, Recurring Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)	Sep. 30, 2013 Commodity contracts Fair Value, Measurements, Recurring Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)	Dec. 31, 2012 Commodity contracts Fair Value, Measurements, Recurring Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)	Dec. 31, 2013 Commodity contracts Fair Value, Measurements, Recurring Significant Other Observable Inputs (Level 2)	Sep. 30, 2013 Commodity contracts Fair Value, Measurements, Recurring Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Commodity contracts Fair Value, Measurements, Recurring Significant Other Observable Inputs (Level 2)	Dec. 31, 2013 Commodity contracts Fair Value, Measurements, Recurring Fair Value Inputs (Level 3)	Sep. 30, 2013 Commodity contracts Fair Value, Measurements, Recurring Fair Value Inputs (Level 3)	Dec. 31, 2012 Commodity contracts Fair Value, Measurements, Recurring Fair Value Inputs (Level 3)	Dec. 31, 2012 Interest rate contracts Fair Value, Measurements, Recurring	Dec. 31, 2012 Interest rate contracts Fair Value, Measurements, Recurring Quoted Prices in Active Markets for Identical Assets and Liabilities (Level 1)	Dec. 31, 2012 Interest rate contracts Fair Value, Measurements, Recurring Significant Other Observable Inputs (Level 2)	Dec. 31, 2012 Interest rate contracts Fair Value, Measurements, Recurring Fair Value Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Derivative financial instruments, assets	$ 3,221	$ 43	$ 8,528	$ 3,221	$ 43	$ 4,299	$ 2,491	$ 43	$ 4,299	$ 730	$ 0	$ 0	$ 0	$ 0	$ 0	$ 4,229	$ 0	$ 4,229	$ 0
Derivative financial instruments, liabilities	$ (372)	$ (6,677)	$ (29,765)	$ (372)	$ (6,677)	$ (5,467)	$ (9)	$ (2,162)	$ (406)	$ (363)	$ (4,515)	$ (5,061)	$ 0	$ 0	$ 0	$ (24,298)	$ 0	$ (24,298)	$ 0

Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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- Definition

Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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