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Employee Benefit Plans Employee Benefit Plans 14 (Details) - USD ($) $ in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Amounts recognized on the balance sheets: |  |  |  |  |  |
Non-current liabilities |  |  |  | $ (57,695) | $ (49,856) |
SERP |  |  |  |  |  |
Amounts recognized on the balance sheets: |  |  |  |  |  |
Current liabilities |  |  |  | (409) | (419) |
Non-current liabilities |  |  |  | (23,653) | (20,364) |
Net amount recognized |  |  |  | (24,062) | (20,783) |
Amounts recognized in regulatory assets consist of: |  |  |  |  |  |
Prior service cost (credit) |  |  |  | 0 | 11 |
Net loss |  |  |  | 7,556 | 6,463 |
Regulatory assets (liabilities) | $ 6,474 | $ 3,452 | $ 3,452 | 7,556 | 6,474 | $ 3,452
Unfunded accrued pension cost |  |  |  | 16,506 | 14,309 |
Net liability (asset) recognized |  |  |  | 24,062 | 20,783 |
Changes in plan assets and benefit obligations recognized in regulatory assets: |  |  |  |  |  |
Regulatory asset at beginning of year | 6,474 | 3,452 |  |  |  |
Net (gain) loss | 1,872 | 3,339 |  |  |  |
Amortization of prior service (cost) credit | (12) | (25) |  |  |  |
Amortization of net gain (loss) | (778) | (292) |  |  |  |
Change in regulatory asset | 1,082 | 3,022 |  |  |  |
Regulatory asset (liability) at end of year | 7,556 | 6,474 | 3,452 |  |  |
Net periodic pension costs | 2,612 | 1,859 | $ 2,015 |  |  |
Change in regulatory asset | 1,082 | 3,022 |  |  |  |
Total recognized in net periodic pension cost and regulatory asset (liability) | 3,694 | 4,881 |  |  |  |
Estimated amounts that will be amortized from regulatory asset over the next fiscal year: |  |  |  |  |  |
Initial net asset (obligation) | 0 | 0 |  |  |  |
Prior service cost | 0 | (11) |  |  |  |
Net gain (loss) | $ (1,049) | $ (777) |  |  |  |
Additional year-end information for plans with an accumulated benefit obligation in excess of plan assets: |  |  |  |  |  |
Projected benefit obligation |  |  |  | 24,062 | 20,783 | $ 16,317
Accumulated benefit obligation |  |  |  | 20,742 | 17,144 |
Fair value of plan assets |  |  |  | $ 0 | $ 0 |
Weighted-average assumptions used to determine benefit obligations at December 31: |  |  |  |  |  |
Discount rate |  |  |  | 3.72% | 4.34% |
Rate of compensation increase |  |  |  | 4.00% | 4.00% |

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- Definition Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans. + 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=64852052&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=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of 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 (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate increase of compensation, used to determine benefit obligation of defined benefit plan. Plan includes, but is not limited to, pay-related 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 (k)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for 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 (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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