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Pension and OPEB (Tables) | 12 Months Ended
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Dec. 31, 2016
Defined Contribution Pension and Other Postretirement Plans Disclosure [Abstract] |
Schedule of Changes in Accumulated Postemployment Benefit Obligations [Table Text Block] |
|  | Pension Benefits |  | Other Postretirement Benefits
|  | at December 31, |  | at December 31,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Change in benefit obligation: |  |  |  |  |  |  |  |
Benefit obligation at beginning of period |  | $ | 763,407 |  |  | $ | 870,471 |  |  | $ | 671,755 |  |  | $ | 760,959 |
Service cost |  | 1,927 |  |  | 8,653 |  |  | — |  |  | — |
Interest cost |  | 25,491 |  |  | 32,095 |  |  | 24,241 |  |  | 27,238 |
Actuarial loss (gain) |  | 46,962 |  |  | (39,563 | ) |  | 77,640 |  |  | (9,224 | )
Plan amendments |  | — |  |  | — |  |  | (28,164 | ) |  | (43,598 | )
Plan transfer* |  | — |  |  | — |  |  | — |  |  | (5,242 | )
Plan curtailments |  | — |  |  | (26,352 | ) |  | — |  |  | — |
Plan settlements |  | (54,197 | ) |  | (51,497 | ) |  | — |  |  | — |
Participant contributions |  | — |  |  | — |  |  | — |  |  | 1,649 |
Benefits and other payments |  | (35,709 | ) |  | (30,400 | ) |  | (45,387 | ) |  | (60,027 | )
Benefit obligation at end of period |  | $ | 747,881 |  |  | $ | 763,407 |  |  | $ | 700,085 |  |  | $ | 671,755 |
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of period |  | $ | 669,039 |  |  | $ | 751,176 |  |  | $ | — |  |  | $ | — |
Actual return (loss) on plan assets |  | 50,575 |  |  | (9,293 | ) |  | — |  |  | — |
Company contributions |  | 2,726 |  |  | 9,053 |  |  | 45,387 |  |  | 58,378 |
Participant contributions |  | — |  |  | — |  |  | — |  |  | 1,649 |
Benefits and other payments |  | (35,709 | ) |  | (30,400 | ) |  | (45,387 | ) |  | (60,027 | )
Plan settlements |  | (54,197 | ) |  | (51,497 | ) |  | — |  |  | — |
Fair value of plan assets at end of period |  | $ | 632,434 |  |  | $ | 669,039 |  |  | $ | — |  |  | $ | — |
Funded status: |  |  |  |  |  |  |  |
Current liabilities |  | $ | (2,904 | ) |  | $ | (2,772 | ) |  | $ | (40,611 | ) |  | $ | (40,863 | )
Noncurrent liabilities |  | (112,543 | ) |  | (91,596 | ) |  | (659,474 | ) |  | (630,892 | )
Net obligation recognized |  | $ | (115,447 | ) |  | $ | (94,368 | ) |  | $ | (700,085 | ) |  | $ | (671,755 | )
Amounts recognized in accumulated other comprehensive income consist of: |  |  |  |  |  |  |  |
Net actuarial loss |  | $ | 299,865 |  |  | $ | 288,695 |  |  | $ | 426,392 |  |  | $ | 367,920 |
Prior service credit |  | (1,611 | ) |  | (2,201 | ) |  | (28,164 | ) |  | — |
Net amount recognized (before tax effect) |  | $ | 298,254 |  |  | $ | 286,494 |  |  | $ | 398,228 |  |  | $ | 367,920 |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | The components of net periodic benefit costs are as follows:
Schedule of Amounts in Accumulated Other Comprehensive Income (Loss) to be Recognized over Next Fiscal Year [Table Text Block] |
|  |  |  | Other
|  | Pension |  | Postretirement
|  | Benefits |  | Benefits
Prior service credit recognition |  | $ | (590 | ) |  | $ | (2,405 | )
Actuarial loss recognition |  | $ | 9,403 |  |  | $ | 23,112 |
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] |
|  | As of December 31,
|  | 2016 |  | 2015
Projected benefit obligation |  | $ | 747,881 |  |  | $ | 763,407 |
Accumulated benefit obligation |  | $ | 745,793 |  |  | $ | 761,124 |
Fair value of plan assets |  | $ | 632,434 |  |  | $ | 669,039 |
Schedule of Assumptions Used [Table Text Block] | The weighted-average assumptions used to determine benefit obligations are as follows:
|  | Pension Benefits |  | Other Postretirement Benefits
|  | For the Year Ended |  | For the Year Ended
|  | December 31, |  | December 31,
|  | 2016 |  | 2015 |  | 2016 |  | 2015
Discount rate |  | 4.31 | % |  | 4.50 | % |  | 4.22 | % |  | 4.50 | %
Rate of compensation increase |  | 3.90 | % |  | 3.80 | % |  | — |  |  | — |
The discount rates are determined using a Company-specific yield curve model (above-mean) developed with the assistance of an external actuary. The Company-specific yield curve models (above-mean) use a subset of the expanded bond universe to determine the Company-specific discount rate. Bonds used in the yield curve are rated AA by Moody's or Standard & Poor's as of the measurement date. The yield curve models parallel the plans' projected cash flows, and the underlying cash flows of the bonds included in the models exceed the cash flows needed to satisfy the Company plans. The weighted-average assumptions used to determine net periodic benefit costs are as follows:
|  | Pension Benefits at |  | Other Postretirement Benefits at
|  | December 31, |  | December 31,
|  | 2016 |  | 2015 |  | 2014 |  | 2016 |  | 2015 |  | 2014
Discount rate |  | 4.52 | % |  | 4.07 | % |  | 4.87 | % |  | 4.50 | % |  | 4.03 | % |  | 4.88 | %
Expected long-term return on plan assets |  | 7.25 | % |  | 7.75 | % |  | 7.75 | % |  | — |  |  | — |  |  | — |
Rate of compensation increase |  | 3.80 | % |  | 3.80 | % |  | 4.21 | % |  | — |  |  | — |  |  | — |
Schedule of Health Care Cost Trend Rates [Table Text Block] | The assumed health care cost trend rates are as follows:
|  | At December 31,
|  | 2016 |  | 2015 |  | 2014
Health care cost trend rate for next year |  | 6.31 | % |  | 6.49 | % |  | 6.03 | %
Rate to which the cost trend is assumed to decline (ultimate trend rate) |  | 4.50 | % |  | 4.50 | % |  | 4.50 | %
Year that the rate reaches ultimate trend rate |  | 2038 |  |  | 2038 |  |  | 2026 |
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] | Assumed health care cost trend rates have a significant effect on the amounts reported for the medical plans. A one-percentage point change in assumed health care cost trend rates would have the following effects:
|  | 1 Percentage |  | 1 Percentage
|  | Point Increase |  | Point Decrease
Effect on total of service and interest cost components |  | $ | 3,659 |  |  | $ | (3,053 | )
Effect on accumulated postretirement benefit obligation |  | $ | 84,381 |  |  | $ | (71,751 | )
Schedule of Effect of Significant Unobservable Inputs, Changes in Plan Assets [Table Text Block] |
Schedule of Allocation of Plan Assets [Table Text Block] | The fair values of plan assets at December 31, 2016 and 2015 by asset category are as follows:
|  | Fair Value Measurements at December 31, 2016 |  | Fair Value Measurements at December 31, 2015
|  |  |  | Quoted |  |  |  |  |  |  |  | Quoted |  |  |  |
|  |  |  | Prices in |  |  |  |  |  |  |  | Prices in |  |  |  |
|  |  |  | Active |  |  |  |  |  |  |  | Active |  |  |  |
|  |  |  | Markets for |  | Significant |  | Significant |  |  |  | Markets for |  | Significant |  | Significant
|  |  |  | Identical |  | Observable |  | Unobservable |  |  |  | Identical |  | Observable |  | Unobservable
|  |  |  | Assets |  | Inputs |  | Inputs |  |  |  | Assets |  | Inputs |  | Inputs
|  | Total |  | (Level 1) |  | (Level 2) |  | (Level 3) |  | Total |  | (Level 1) |  | (Level 2) |  | (Level 3)
Asset Category |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash/Accrued Income |  | $ | 639 |  |  | $ | 639 |  |  | $ | — |  |  | $ | — |  |  | $ | 631 |  |  | $ | 631 |  |  | $ | — |  |  | $ | — |
US Equities (a) |  | 11 |  |  | 11 |  |  | — |  |  | — |  |  | 10 |  |  | 10 |  |  | — |  |  | — |
Mercer Common Collective Trusts (b) |  | 631,784 |  |  | — |  |  | — |  |  | — |  |  | 668,398 |  |  | — |  |  | — |  |  | — |
Total |  | $ | 632,434 |  |  | $ | 650 |  |  | $ | — |  |  | $ | — |  |  | $ | 669,039 |  |  | $ | 641 |  |  | $ | — |  |  | $ | — |
Schedule of Expected Benefit Payments [Table Text Block] | The following benefit payments, reflecting expected future service, are expected to be paid:

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- Definition Tabular disclosure of the change in the accumulated postemployment benefit obligation from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + 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 + Details
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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e2439-114920 Reference 2: 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 3: 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 Reference 4: 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 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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