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Fair Value Measurements (Details) (USD $)	Jun. 30, 2014	Dec. 31, 2013
NQDC plan
Assets and liabilities measured at estimated fair value on a recurring basis
Number of investment assets	2
Fair value measured on recurring basis | Level 1
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	$ 23,569,000	$ 11,574,000
Liabilities	13,583,000	14,032,000
Fair value measured on recurring basis | Level 2
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	53,893,000	50,056,000
Liabilities	52,177,000	43,993,000
Fair value measured on recurring basis | Level 3
Assets and liabilities measured at estimated fair value on a recurring basis
Debt	693,500,000	463,700,000
Notes receivable	13,200,000	20,900,000
Assets	5,826,000
Fair value measured on recurring basis | Sub-Total
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	83,288,000	61,630,000
Liabilities	65,760,000	58,025,000
Fair value measured on recurring basis | Netting and Collateral
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	(51,047,000)	(42,540,000)
Liabilities	(48,981,000)	(37,886,000)
Fair value measured on recurring basis | Total
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	32,241,000	19,090,000
Liabilities	16,779,000	20,139,000
Cash surrender value of life insurance | Fair value measured on recurring basis | Level 2
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	1,754,000
Cash surrender value of life insurance | Fair value measured on recurring basis | Sub-Total
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	1,754,000
Cash surrender value of life insurance | Fair value measured on recurring basis | Total
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	1,754,000
Mutual funds | Fair value measured on recurring basis | Level 1
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	361,000
Mutual funds | Fair value measured on recurring basis | Sub-Total
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	361,000
Mutual funds | Fair value measured on recurring basis | Total
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	361,000
Commodity contracts
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	29,611,000	15,471,000
Liabilities	10,455,000	14,686,000
Foreign currency contracts
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	515,000	2,136,000
Liabilities	5,245,000	5,453,000
Derivative liability | Commodity contracts | Fair value measured on recurring basis | Level 1
Assets and liabilities measured at estimated fair value on a recurring basis
Liabilities	13,583,000	14,032,000
Derivative liability | Commodity contracts | Fair value measured on recurring basis | Level 2
Assets and liabilities measured at estimated fair value on a recurring basis
Liabilities	40,737,000	31,983,000
Derivative liability | Commodity contracts | Fair value measured on recurring basis | Sub-Total
Assets and liabilities measured at estimated fair value on a recurring basis
Liabilities	54,320,000	46,015,000
Derivative liability | Commodity contracts | Fair value measured on recurring basis | Netting and Collateral
Assets and liabilities measured at estimated fair value on a recurring basis
Liabilities	(43,865,000)	(31,329,000)
Derivative liability | Commodity contracts | Fair value measured on recurring basis | Total
Assets and liabilities measured at estimated fair value on a recurring basis
Liabilities	10,455,000	14,686,000
Derivative liability | Foreign currency contracts | Fair value measured on recurring basis | Level 2
Assets and liabilities measured at estimated fair value on a recurring basis
Liabilities	9,889,000	11,803,000
Derivative liability | Foreign currency contracts | Fair value measured on recurring basis | Sub-Total
Assets and liabilities measured at estimated fair value on a recurring basis
Liabilities	9,889,000	11,803,000
Derivative liability | Foreign currency contracts | Fair value measured on recurring basis | Netting and Collateral
Assets and liabilities measured at estimated fair value on a recurring basis
Liabilities	(4,644,000)	(6,350,000)
Derivative liability | Foreign currency contracts | Fair value measured on recurring basis | Total
Assets and liabilities measured at estimated fair value on a recurring basis
Liabilities	5,245,000	5,453,000
Derivative liability | Inventories | Fair value measured on recurring basis | Level 2
Assets and liabilities measured at estimated fair value on a recurring basis
Liabilities	1,551,000	207,000
Derivative liability | Inventories | Fair value measured on recurring basis | Sub-Total
Assets and liabilities measured at estimated fair value on a recurring basis
Liabilities	1,551,000	207,000
Derivative liability | Inventories | Fair value measured on recurring basis | Netting and Collateral
Assets and liabilities measured at estimated fair value on a recurring basis
Liabilities	(472,000)	(207,000)
Derivative liability | Inventories | Fair value measured on recurring basis | Total
Assets and liabilities measured at estimated fair value on a recurring basis
Liabilities	1,079,000
Derivative asset | Commodity contracts | Fair value measured on recurring basis | Level 1
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	23,208,000	11,574,000
Derivative asset | Commodity contracts | Fair value measured on recurring basis | Level 2
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	46,508,000	39,880,000
Derivative asset | Commodity contracts | Fair value measured on recurring basis | Level 3
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	5,826,000
Derivative asset | Commodity contracts | Fair value measured on recurring basis | Sub-Total
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	75,542,000	51,454,000
Derivative asset | Commodity contracts | Fair value measured on recurring basis | Netting and Collateral
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	(45,931,000)	(35,983,000)
Derivative asset | Commodity contracts | Fair value measured on recurring basis | Total
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	29,611,000	15,471,000
Derivative asset | Foreign currency contracts | Fair value measured on recurring basis | Level 2
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	5,159,000	8,486,000
Derivative asset | Foreign currency contracts | Fair value measured on recurring basis | Sub-Total
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	5,159,000	8,486,000
Derivative asset | Foreign currency contracts | Fair value measured on recurring basis | Netting and Collateral
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	(4,644,000)	(6,350,000)
Derivative asset | Foreign currency contracts | Fair value measured on recurring basis | Total
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	515,000	2,136,000
Derivative asset | Inventories | Fair value measured on recurring basis | Level 2
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	472,000	1,690,000
Derivative asset | Inventories | Fair value measured on recurring basis | Sub-Total
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	472,000	1,690,000
Derivative asset | Inventories | Fair value measured on recurring basis | Netting and Collateral
Assets and liabilities measured at estimated fair value on a recurring basis
Assets	(472,000)	(207,000)
Derivative asset | Inventories | Fair value measured on recurring basis | Total
Assets and liabilities measured at estimated fair value on a recurring basis
Assets		$ 1,483,000

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- Definition

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 825

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- Definition

Fair value of financial and nonfinancial obligations.

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 820

-SubTopic 10

-Section 50

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Fair value portion of an agreement for an unconditional promise by the maker to pay the holder a definite sum of money at a future date.

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-Publisher FASB

-Name Accounting Standards Codification

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-Section S99

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-Subparagraph (SX 210.5-02.3(b))

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