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Commitments and Contingent Liabilities Amount of Commitment Expiration Per Period (Details) $ in Thousands	Mar. 31, 2018 USD ($)
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	$ 272,953
Less Than 1 Year [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	270,518
1-3 Years [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	2,435
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	252,882
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 [Domain]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	253,167
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	252,882
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 [Domain]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	253,167
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 [Domain]
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 [Domain]
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 [Domain]
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	12,498
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	5,438
Surety Bond [Member] | Loss Contingencies by Secondary Nature of Contingency [Domain]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	19,786
Surety Bond [Member] | Less Than 1 Year [Member] | Other Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	11,988
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	3,513
Surety Bond [Member] | Less Than 1 Year [Member] | Loss Contingencies by Secondary Nature of Contingency [Domain]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	17,351
Surety Bond [Member] | 1-3 Years [Member] | Other Commitments [Member]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	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	1,925
Surety Bond [Member] | 1-3 Years [Member] | Loss Contingencies by Secondary Nature of Contingency [Domain]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	2,435
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 [Domain]
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 [Domain]
Schedule of Costs Related to Purchase Obligations [Line Items]
Guarantor obligations, maximum exposure	$ 0

X

- Definition

Schedule of Costs Related to Purchase Obligations [Line Items]

+ References

No definition available.

+ Details

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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://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
-URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248

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