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Employee Benefit Plans Employee Benefit Plans 3 (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015
Amounts recognized on the balance sheets: |  |  |  |  |
Non-current liabilities |  |  |  | $ 49,856 | $ 42,666
Pension Benefits |  |  |  |  |
Amounts recognized on the balance sheets: |  |  |  |  |
Non-current assets |  |  |  | 0 | 0
Current liabilities |  |  |  | 0 | 0
Non-current liabilities |  |  |  | 29,492 | 26,760
Net amount recognized |  |  |  | (29,492) | (26,760)
Amounts recognized in regulatory assets consist of: |  |  |  |  |
Initial net obligation |  |  |  | 0 | 0
Prior service cost (credit) |  |  |  | 0 | 49
Net (gain) loss |  |  |  | (25,828) | (21,921)
Regulatory assets (liabilities) | $ 21,970 | $ 39,170 | $ 39,170 | 25,828 | 21,970
Unfunded accrued pension cost |  |  |  | (3,664) | (4,790)
Net liability (asset) recognized |  |  |  | 29,492 | 26,760
Changes in plan assets and benefit obligations recognized in regulatory assets: |  |  |  |  |
Regulatory asset at beginning of year | 21,970 | 39,170 |  |  |
Net loss (gain) | (4,818) | 15,292 |  |  |
Amortization of initial net obligation | 0 | 0 |  |  |
Amortization of prior service (cost) credit | (49) | (118) |  |  |
Amortization of net gain (loss) | (911) | (1,790) |  |  |
Total change in regulatory asset | 3,858 | (17,200) |  |  |
Regulatory asset (liability) at end of year | 25,828 | 21,970 | 39,170 |  |
Net periodic pension costs | 4,126 | 6,075 | 4,383 |  |
Change in regulatory asset | 3,858 | (17,200) |  |  |
Total recognized in net periodic pension cost and regulatory asset (liability) | 7,984 | (11,125) |  |  |
Estimated amounts that will be amortized from regulatory asset over the next fiscal year: |  |  |  |  |
Prior service (cost) credit | 0 | (49) |  |  |
Net gain (loss) | (835) | (510) |  |  |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |  |  |
Projected benefit obligation |  |  |  | 180,364 | 168,934
Accumulated benefit obligation |  |  |  | 165,998 | 155,469
Fair value of plan assets |  |  |  | $ 150,872 | $ 142,174
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |  |
Discount rate |  |  |  | 4.44% | 4.65%
Post-Retirement Medical Benefits |  |  |  |  |
Amounts recognized on the balance sheets: |  |  |  |  |
Non-current assets |  |  |  | $ 1,736 | $ 1,221
Current liabilities |  |  |  | 0 | 0
Non-current liabilities |  |  |  | 0 | 0
Net amount recognized |  |  |  | 1,736 | 1,221
Amounts recognized in regulatory assets consist of: |  |  |  |  |
Initial net obligation |  |  |  | 0 | 0
Prior service cost (credit) |  |  |  | 0 | (34)
Net (gain) loss |  |  |  | 5,515 | 5,572
Regulatory assets (liabilities) | (5,606) | (3,125) | (3,125) | (5,515) | (5,606)
Unfunded accrued pension cost |  |  |  | (3,779) | (4,385)
Net liability (asset) recognized |  |  |  | (1,736) | (1,221)
Changes in plan assets and benefit obligations recognized in regulatory assets: |  |  |  |  |
Regulatory asset at beginning of year | (5,606) | (3,125) |  |  |
Net loss (gain) | 644 | 2,997 |  |  |
Amortization of initial net obligation | 0 | 0 |  |  |
Amortization of prior service (cost) credit | 34 | 200 |  |  |
Amortization of net gain (loss) | 701 | 316 |  |  |
Total change in regulatory asset | 91 | (2,481) |  |  |
Regulatory asset (liability) at end of year | (5,515) | (5,606) | (3,125) |  |
Net periodic pension costs | (606) | (234) | $ 278 |  |
Change in regulatory asset | 91 | (2,481) |  |  |
Total recognized in net periodic pension cost and regulatory asset (liability) | (515) | (2,715) |  |  |
Estimated amounts that will be amortized from regulatory asset over the next fiscal year: |  |  |  |  |
Prior service (cost) credit | 0 | 34 |  |  |
Net gain (loss) | $ 679 | $ 599 |  |  |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |  |  |
Projected benefit obligation |  |  |  | 8,802 | 9,393
Fair value of plan assets |  |  |  | $ 10,538 | $ 10,614
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |  |
Discount rate |  |  |  | 3.97% | 4.25%
Minimum | Pension Benefits |  |  |  |  |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |  |
Rate of compensation increase |  |  |  | 3.00% |
Maximum | Pension Benefits |  |  |  |  |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |  |
Rate of compensation increase |  |  |  | 8.00% |

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- Definition Represents the amount of unfunded accrued pension cost recognized in regulatory assets that is associated with the defined benefit pension plans and other post-retirement defined benefit plans. + References No definition available. + Details
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- Definition The aggregate net amount recognized in the balance sheet associated with the defined benefit plan(s). Will normally be the same as the Defined Benefit Plan, Funded Status of Plan, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition The amount for overfunded plans recognized in the balance sheet as a noncurrent asset associated with a defined benefit pension plan or other postretirement defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915240&loc=d3e1703-114919 + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive income (AOCI) related to prior service cost (credit) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position. + References No definition available. + Details
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- Definition The total amount of net periodic benefit cost for defined benefit plans for the period. Periodic benefit costs include the following components: service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=58242635&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 + Details
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