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Maximum Potential Total of Future Payments Under Commitment Instruments (Details) $ in Thousands | Dec. 31, 2016 USD ($)
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Loss Contingencies [Line Items] |
Loss Contingency, Range of Possible Loss, Portion Not Accrued | $ 937,421
Maximum potential total of future payments under commitments | 1,049,957
Surety Bond [Member] |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 325,676
Surety Bond [Member] | Employee-Related |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 82,273
Surety Bond [Member] | Environmental |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 998
Surety Bond [Member] | Other Commitments |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 242,405
Surety Bonds: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 650,078
Surety Bonds: | Employee-Related |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 112,810
Surety Bonds: | Environmental |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 514,851
Surety Bonds: | Other Commitments |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 22,417
Guarantees [Member] |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 74,203
Guarantees [Member] | Other Commitments |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 74,203
Balance on First Anniversary [Member] |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 954,774
Balance on First Anniversary [Member] | Surety Bond [Member] |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 296,784
Balance on First Anniversary [Member] | Surety Bond [Member] | Employee-Related |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 67,871
Balance on First Anniversary [Member] | Surety Bond [Member] | Environmental |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 600
Balance on First Anniversary [Member] | Surety Bond [Member] | Other Commitments |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 228,313
Balance on First Anniversary [Member] | Surety Bonds: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 616,705
Balance on First Anniversary [Member] | Surety Bonds: | Employee-Related |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 111,510
Balance on First Anniversary [Member] | Surety Bonds: | Environmental |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 483,604
Balance on First Anniversary [Member] | Surety Bonds: | Other Commitments |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 21,591
Balance on First Anniversary [Member] | Guarantees [Member] |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 41,285
Balance on First Anniversary [Member] | Guarantees [Member] | Other Commitments |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 41,285
More Than One And Within Three Years From Balance Sheet Date [Member] |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 80,030
More Than One And Within Three Years From Balance Sheet Date [Member] | Surety Bond [Member] |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 28,892
More Than One And Within Three Years From Balance Sheet Date [Member] | Surety Bond [Member] | Employee-Related |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 14,402
More Than One And Within Three Years From Balance Sheet Date [Member] | Surety Bond [Member] | Environmental |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 398
More Than One And Within Three Years From Balance Sheet Date [Member] | Surety Bond [Member] | Other Commitments |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 14,092
More Than One And Within Three Years From Balance Sheet Date [Member] | Surety Bonds: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 33,371
More Than One And Within Three Years From Balance Sheet Date [Member] | Surety Bonds: | Employee-Related |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 1,300
More Than One And Within Three Years From Balance Sheet Date [Member] | Surety Bonds: | Environmental |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 31,247
More Than One And Within Three Years From Balance Sheet Date [Member] | Surety Bonds: | Other Commitments |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 824
More Than One And Within Three Years From Balance Sheet Date [Member] | Guarantees [Member] |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 17,767
More Than One And Within Three Years From Balance Sheet Date [Member] | Guarantees [Member] | Other Commitments |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 17,767
More Than Three And Within Five Years From Balance Sheet Date [Member] |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 13,403
More Than Three And Within Five Years From Balance Sheet Date [Member] | Surety Bond [Member] |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 0
More Than Three And Within Five Years From Balance Sheet Date [Member] | Surety Bond [Member] | Employee-Related |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 0
More Than Three And Within Five Years From Balance Sheet Date [Member] | Surety Bond [Member] | Environmental |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 0
More Than Three And Within Five Years From Balance Sheet Date [Member] | Surety Bond [Member] | Other Commitments |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 0
More Than Three And Within Five Years From Balance Sheet Date [Member] | Surety Bonds: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 2
More Than Three And Within Five Years From Balance Sheet Date [Member] | Surety Bonds: | Employee-Related |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 0
More Than Three And Within Five Years From Balance Sheet Date [Member] | Surety Bonds: | Environmental |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 0
More Than Three And Within Five Years From Balance Sheet Date [Member] | Surety Bonds: | Other Commitments |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 2
More Than Three And Within Five Years From Balance Sheet Date [Member] | Guarantees [Member] |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 13,401
More Than Three And Within Five Years From Balance Sheet Date [Member] | Guarantees [Member] | Other Commitments |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 13,401
Beyond Five Years of Balance Sheet Date [Member] |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 1,750
Beyond Five Years of Balance Sheet Date [Member] | Surety Bond [Member] |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 0
Beyond Five Years of Balance Sheet Date [Member] | Surety Bond [Member] | Employee-Related |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 0
Beyond Five Years of Balance Sheet Date [Member] | Surety Bond [Member] | Environmental |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 0
Beyond Five Years of Balance Sheet Date [Member] | Surety Bond [Member] | Other Commitments |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 0
Beyond Five Years of Balance Sheet Date [Member] | Surety Bonds: |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 0
Beyond Five Years of Balance Sheet Date [Member] | Surety Bonds: | Employee-Related |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 0
Beyond Five Years of Balance Sheet Date [Member] | Surety Bonds: | Environmental |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 0
Beyond Five Years of Balance Sheet Date [Member] | Surety Bonds: | Other Commitments |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 0
Beyond Five Years of Balance Sheet Date [Member] | Guarantees [Member] |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | 1,750
Beyond Five Years of Balance Sheet Date [Member] | Guarantees [Member] | Other Commitments |
Loss Contingencies [Line Items] |
Maximum potential total of future payments under commitments | $ 1,750

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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=6851643&loc=d3e12069-110248 + Details
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- Definition The difference between the maximum amount of estimated loss and the amount recorded as of the balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 05 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6395354&loc=d3e12631-108344 + Details
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