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Employee Benefit Plans Employee Benefit Plans 14 (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Amounts recognized on the balance sheets: |  |  |  |  |  |
Non-current liabilities |  |  |  | $ 49,856 | $ 42,666 |
SERP |  |  |  |  |  |
Amounts recognized on the balance sheets: |  |  |  |  |  |
Current liabilities |  |  |  | 419 | 411 |
Non-current liabilities |  |  |  | 20,364 | 15,906 |
Net amount recognized |  |  |  | (20,783) | (16,317) |
Amounts recognized in regulatory assets consist of: |  |  |  |  |  |
Prior service cost (credit) |  |  |  | 11 | 36 |
Net (gain) loss |  |  |  | (6,463) | (3,416) |
Regulatory assets (liabilities) | $ 3,452 | $ 4,683 | $ 4,683 | 6,474 | 3,452 | $ 4,683
Unfunded accrued pension cost |  |  |  | (14,309) | (12,865) |
Net liability (asset) recognized |  |  |  | 20,783 | 16,317 |
Changes in plan assets and benefit obligations recognized in regulatory assets: |  |  |  |  |  |
Regulatory asset at beginning of year | 3,452 | 4,683 |  |  |  |
Net loss (gain) | (3,339) | 683 |  |  |  |
Amortization of prior service (cost) credit | (25) | (117) |  |  |  |
Amortization of net gain (loss) | (292) | (431) |  |  |  |
Total change in regulatory asset | 3,022 | (1,231) |  |  |  |
Regulatory asset (liability) at end of year | 6,474 | 3,452 | 4,683 |  |  |
Net periodic pension costs | 1,859 | 2,015 | $ 1,683 |  |  |
Change in regulatory asset | 3,022 | (1,231) |  |  |  |
Total recognized in net periodic pension cost and regulatory asset (liability) | 4,881 | 784 |  |  |  |
Estimated amounts that will be amortized from regulatory asset over the next fiscal year: |  |  |  |  |  |
Initial net asset (obligation) | 0 | 0 |  |  |  |
Prior service cost | (11) | (25) |  |  |  |
Net gain (loss) | $ (777) | $ (292) |  |  |  |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |  |  |  |
Projected benefit obligation |  |  |  | 20,783 | 16,317 | $ 15,926
Accumulated benefit obligation |  |  |  | 17,144 | 14,533 |
Fair value of plan assets |  |  |  | $ 0 | $ 0 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |  |  |
Discount rate |  |  |  | 4.34% | 4.61% |
Rate of compensation increase |  |  |  | 4.00% | 4.00% |

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- Definition Represents the net gains (losses) that are not recognized immediately and are expected to be recognized as components of regulatory asset over the next fiscal year that follows the most recent annual statement of financial position presented. + References No definition available. + Details
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- Definition Represents the prior service cost or credit expected to be recognized as components of regulatory asset over the next fiscal year that follows the most recent annual statement of financial position presented. + References No definition available. + Details
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- Definition Represents the amortization of prior service cost (credit) that are recognized as a component of regulatory assets (liability). + References No definition available. + Details
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- Definition Represents the net gains and losses recognized in regulatory asset (liability). + References No definition available. + Details
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- Definition Represents the amount recognized in regulatory asset (liability). + References No definition available. + Details
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- Definition Represents the prior service cost (credit) recognized in regulatory asset (liability). + References No definition available. + Details
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- Definition Defined Benefit Plan, Amounts Recognized in Regulatory Assets (Liabilities), Net + References No definition available. + Details
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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 Represents the net amount of loss (gain) that are recognized as a component of regulatory assets (liability). + References No definition available. + Details
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- Definition Represents the amount recognized in net periodic pension cost and regulatory asset. + 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 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 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + 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 (a) -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 -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 + 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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- Definition If aggregate disclosures are presented, the aggregate fair value of plan assets 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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- Definition For a classified balance sheet, the amount recognized in balance sheet as a current liability associated with an underfunded defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Liabilities -URI http://asc.fasb.org/extlink&oid=6509677 Reference 2: 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 3: 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 This represents the noncurrent liability for underfunded plans recognized in the balance sheet that is associated with the defined benefit pension plans and other postretirement defined benefit plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2417-114920 Reference 2: 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 3: 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 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2410-114920 + Details
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