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Pension Benefits (Details) - USD ($) | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |  |
Projected benefit obligation at beginning of year |  | $ 69,659,000 | $ 62,547,000 |
Defined Benefit Plan, Service Cost |  | 6,638,000 | 8,200,000 | $ 7,949,000
Defined Benefit Plan, Interest Cost |  | 2,689,000 | 2,908,000 | 2,496,000
Defined Benefit Plan, Actuarial Loss |  | 3,708,000 | 2,662,000 |
Defined Benefit Plan, Benefits Paid |  | (10,757,000) | (6,658,000) |
Projected benefit obligation at end of year |  | 71,937,000 | 69,659,000 | 62,547,000
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Defined Benefit Plan, Fair value of plan assets at beginning of year |  | 31,731,000 | 25,769,000 |
Defined Benefit Plan, Actual Return on Plan Assets |  | 2,956,000 | 1,575,000 |
Defined Benefit Plan, Employer Contribution |  | 7,048,000 | 11,045,000 | 6,400,000
Defined Benefit Plan, Benefits Paid |  | (10,757,000) | (6,658,000) | (8,200,000)
Defined Benefit Plan, Fair value of plan assets at end of year |  | 30,978,000 | 31,731,000 | 25,769,000
Defined Benefit Plan, Funded (Unfunded) Status |  | (40,959,000) | (37,928,000) |
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year |  | 4,000,000 |  |
Defined Benefit Plan, Pension Plan with Accumulated Benefit Obligation in Excess of Plan Assets [Abstract] |  |  |  |
Defined Benefit Plan, Projected Benefit Obligation |  | 71,937,000 | 69,659,000 |
Defined Benefit Plan, Accumulated Benefit Obligation |  | 56,045,000 | 54,681,000 |
Defined Benefit Plan, Fair Value of Plan Assets |  | 30,978,000 | 31,731,000 |
Defined Benefit Plan, Unfunded Accumulated Benefit Obligation |  | $ 25,067,000 | 22,950,000 |
Defined Benefit Plan, Unrecognized Net Gain (Loss) Amortization Threshold |  | 10.00% |  |
Pre-tax Amounts Recognized in Accumulated Other Comprehensive Income [Abstract] |  |  |  |
Defined Benefit Plan, Unrecognized Actuarial Losses |  | $ 21,397,000 | 22,708,000 |
Defined Benefit Plan, Unrecognized Prior Service Costs |  | 66,000 | 83,000 |
Defined Benefit Plan, Accumulated Other Comprehensive Loss |  | 21,463,000 | 22,791,000 |
Defined Benefit Plans, Amounts that Will be Amortized from Accumulated Other Comprehensive Loss) in Next Fiscal Year |  | 1,300,000 |  |
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss) [Abstract] |  |  |  |
Other Comprehensive Income (Loss), Defined Benefit Plan, Net Actuarial Loss |  | (2,995,000) | (3,322,000) | (4,990,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Amortization of Prior Service Cost |  | 17,000 | 16,000 | 17,000
Other Comprehensive Income (Loss), Defined Benefit Plan, Amortization of Net Actuarial Loss |  | 1,297,000 | 1,582,000 | 1,486,000
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlements |  | 3,009,000 | 0 | 350,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Total Pension Liability Adjustment, Pre-Tax |  | 1,328,000 | (1,724,000) | (3,137,000)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Tax (Expense) Benefit |  | (561,000) | 570,000 | 1,047,000
Other Comprehensive (Income) Loss, Defined Benefit Plan, Total Pension Liability Adjustment, Net of Tax | [1] | (767,000) | 1,154,000 | 2,090,000
Components of Net Periodic Benefit Costs for Both Pension Plans |  |  |  |
Defined Benefit Plan, Service Cost |  | 6,638,000 | 8,200,000 | 7,949,000
Defined Benefit Plan, Interest Cost |  | 2,689,000 | 2,908,000 | 2,496,000
Defined Benefit Plan, Expected Return on Plan Assets that Reduces Periodic Pension Benefit Cost |  | (2,244,000) | (2,235,000) | (2,182,000)
Defined Benefit Plan, Amortization of Prior Service Cost |  | 17,000 | 16,000 | 17,000
Defined Benefit Plan, Amortization Net Actuarial Loss |  | 1,297,000 | 1,582,000 | 1,486,000
Defined Benefit Plan, Settlements |  | 3,009,000 | 0 | 350,000
Defined Benefit Plan, Net Periodic Benefit Cost |  | $ 11,406,000 | $ 10,471,000 | $ 10,116,000
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation and Net Periodic Benefit Cost [Abstract] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate |  | 3.80% | 4.20% |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Rate of Compensation Increase |  | 6.20% | 6.20% |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Discount Rate |  | 4.20% | 4.70% | 4.30%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Return on Plan Assets | [2] | 6.50% | 7.50% | 7.50%
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Rate of Compensation Increase |  | 6.20% | 6.20% | 6.20%
Future Benefit Payments |  |  |  |
Defined Benefit Plan, Expected Future Benefit Payments in Year One |  | $ 4,217,000 |  |
Defined Benefit Plan, Expected Future Benefit Payments in Year Two |  | 3,818,000 |  |
Defined Benefit Plan, Expected Future Benefit Payments in Year Three |  | 4,363,000 |  |
Defined Benefit Plan, Expected Future Benefit Payments in Year Four |  | 5,561,000 |  |
Defined Benefit Plan, Expected Future Benefit Payments in Year Five |  | 6,117,000 |  |
Defined Benefit Plan, Expected Future Benefit Payments in Five Fiscal Years Thereafter |  | 36,279,000 |  |
Qualified Plan [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Defined Benefit Plan, Plan Assets Returned |  | 0 |  |
Nonqualified Plan [Member] |  |  |  |
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward] |  |  |  |
Defined Benefit Plan, Fair value of plan assets at beginning of year |  | 0 | $ 0 |
Defined Benefit Plan, Fair value of plan assets at end of year |  | $ 0 | $ 0 | $ 0
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation and Net Periodic Benefit Cost [Abstract] |  |  |  |
Defined Benefit Plan, Assumptions Used Calculating Net Periodic Benefit Cost, Expected Return on Plan Assets |  |  | 0.00% | 0.00%
[1] | Please refer to Note 8 – Pension Benefits for additional discussion on the pension liability adjustment.
[2] | There is no assumed expected return on plan assets for the Nonqualified Pension Plan because there are no plan assets in the Nonqualified Pension Plan.

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- Definition Gain and loses in excess of 10% of the greater of the projected benefit obligation or fari value of plan assets will be amortized over the average remaining service period + References No definition available. + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 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=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + 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 (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive 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)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) 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 (h)(5) -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 of return on plan assets, reflecting average rate of earnings expected on existing plan assets and expected contributions, used to determine net periodic benefit cost 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in five fiscal years after fifth fiscal year following latest fiscal year. + 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 (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in next fiscal year following latest fiscal year. + 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 (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of benefits for defined benefit plan expected to be paid in fifth fiscal year following latest fiscal year. + 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 (f) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant under defined benefit plan which decreases plan assets. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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