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Amount of Commitment Expiration Per Period (Details) $ in Thousands	Jun. 30, 2018 USD ($)
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	$ 291,480
Less Than 1 Year [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	289,911
1-3 Years [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	1,569
3-5 Years [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Beyond 5 Years [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Standby Letters of Credit [Member] | Firm Transportation [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	251,057
Standby Letters of Credit [Member] | Other Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	285
Standby Letters of Credit [Member] | Loss Contingencies by Secondary Nature of Contingency [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	251,342
Standby Letters of Credit [Member] | Less Than 1 Year [Member] | Firm Transportation [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	251,057
Standby Letters of Credit [Member] | Less Than 1 Year [Member] | Other Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	285
Standby Letters of Credit [Member] | Less Than 1 Year [Member] | Loss Contingencies by Secondary Nature of Contingency [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	251,342
Standby Letters of Credit [Member] | 1-3 Years [Member] | Firm Transportation [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Standby Letters of Credit [Member] | 1-3 Years [Member] | Other Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Standby Letters of Credit [Member] | 1-3 Years [Member] | Loss Contingencies by Secondary Nature of Contingency [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Standby Letters of Credit [Member] | 3-5 Years [Member] | Firm Transportation [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Standby Letters of Credit [Member] | 3-5 Years [Member] | Other Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Standby Letters of Credit [Member] | 3-5 Years [Member] | Loss Contingencies by Secondary Nature of Contingency [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Standby Letters of Credit [Member] | Beyond 5 Years [Member] | Firm Transportation [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Standby Letters of Credit [Member] | Beyond 5 Years [Member] | Other Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Standby Letters of Credit [Member] | Beyond 5 Years [Member] | Loss Contingencies by Secondary Nature of Contingency [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond [Member] | Other Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	12,315
Surety Bond [Member] | Employee Related Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	1,850
Surety Bond [Member] | Environment Related Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	25,973
Surety Bond [Member] | Loss Contingencies by Secondary Nature of Contingency [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	40,138
Surety Bond [Member] | Less Than 1 Year [Member] | Other Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	10,805
Surety Bond [Member] | Less Than 1 Year [Member] | Employee Related Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	1,850
Surety Bond [Member] | Less Than 1 Year [Member] | Environment Related Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	25,914
Surety Bond [Member] | Less Than 1 Year [Member] | Loss Contingencies by Secondary Nature of Contingency [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	38,569
Surety Bond [Member] | 1-3 Years [Member] | Other Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	1,510
Surety Bond [Member] | 1-3 Years [Member] | Employee Related Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond [Member] | 1-3 Years [Member] | Environment Related Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	59
Surety Bond [Member] | 1-3 Years [Member] | Loss Contingencies by Secondary Nature of Contingency [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	1,569
Surety Bond [Member] | 3-5 Years [Member] | Other Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond [Member] | 3-5 Years [Member] | Employee Related Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond [Member] | 3-5 Years [Member] | Environment Related Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond [Member] | 3-5 Years [Member] | Loss Contingencies by Secondary Nature of Contingency [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond [Member] | Beyond 5 Years [Member] | Other Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond [Member] | Beyond 5 Years [Member] | Employee Related Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond [Member] | Beyond 5 Years [Member] | Environment Related Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	0
Surety Bond [Member] | Beyond 5 Years [Member] | Loss Contingencies by Secondary Nature of Contingency [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	$ 0

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- Definition

Schedule of Costs Related to Purchase Obligations [Line Items]

+ References

No definition available.

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- Definition

Maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee or each group of similar guarantees before reduction for potential recoveries under recourse or collateralization provisions.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=115931803&loc=d3e12069-110248

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