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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Retirement Benefits [Abstract] |
Schedule of Changes in Projected Benefit Obligations [Table Text Block] | A December 31 measurement date is used for all of the defined benefit and postretirement plans. The status of these plans as of December 31, 2018 and 2017 is summarized below (dollars in thousands):
|  | December 31,
|  | Pension Benefits |  | Other Benefits
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Change in benefit obligation: |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 172,143 |  |  | $ | 161,955 |  |  | $ | 70,198 |  |  | $ | 60,524 |
Service cost |  | 12,502 |  |  | 10,686 |  |  | 3,028 |  |  | 2,543 |
Interest Cost |  | 5,405 |  |  | 5,326 |  |  | 2,319 |  |  | 2,118 |
Participant contributions |  | — |  |  | — |  |  | 432 |  |  | 354 |
Amendments |  | — |  |  | 159 |  |  | — |  |  | — |
Actuarial (gains) losses |  | (1,045 | ) |  | 11,336 |  |  | (7,172 | ) |  | 5,510 |
Settlement (gains) losses |  | — |  |  | (438 | ) |  | — |  |  | — |
Settlements |  | — |  |  | (12,907 | ) |  | — |  |  | — |
Benefits paid |  | (7,801 | ) |  | (5,974 | ) |  | (1,409 | ) |  | (851 | )
Foreign exchange translations and other adjustments |  | (2,600 | ) |  | 2,000 |  |  | — |  |  | — |
Benefit obligation at end of year |  | $ | 178,604 |  |  | $ | 172,143 |  |  | $ | 67,396 |  |  | $ | 70,198 |
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] |
|  | December 31,
|  | Pension Benefits |  | Other Benefits
|  | 2018 |  | 2017 |  | 2018 |  | 2017
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 103,236 |  |  | $ | 84,770 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets |  | (6,464 | ) |  | 14,481 |  |  | — |  |  | — |
Employer contributions |  | 13,590 |  |  | 22,866 |  |  | 977 |  |  | 497 |
Participant contributions |  | — |  |  | — |  |  | 432 |  |  | 354 |
Disbursement for settlements |  | — |  |  | (12,907 | ) |  | — |  |  | — |
Benefits paid and expenses |  | (7,801 | ) |  | (5,974 | ) |  | (1,409 | ) |  | (851 | )
Fair value of plan assets at end of year |  | $ | 102,561 |  |  | $ | 103,236 |  |  | $ | — |  |  | $ | — |
Funded status at end of year |  | $ | (76,043 | ) |  | $ | (68,907 | ) |  | $ | (67,396 | ) |  | $ | (70,198 | )
Schedule of Net Funded Status [Table Text Block] |
|  | December 31,
|  | Qualified Plans |  | Non-Qualified Plans(1) |  | Total
|  | 2018 |  | 2017 |  | 2018 |  | 2017 |  | 2018 |  | 2017
Aggregate fair value of plan assets |  | $ | 102,561 |  |  | $ | 103,236 |  |  | $ | — |  |  | $ | — |  |  | $ | 102,561 |  |  | $ | 103,236 |
Aggregate projected benefit obligations |  | 112,093 |  |  | 107,072 |  |  | 66,511 |  |  | 65,071 |  |  | 178,604 |  |  | 172,143 |
Under funded |  | $ | (9,532 | ) |  | $ | (3,836 | ) |  | $ | (66,511 | ) |  | $ | (65,071 | ) |  | $ | (76,043 | ) |  | $ | (68,907 | )
(1) | For non-qualified plans, there are no required funding levels.
Schedule of Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] |
| December 31,
| Pension Benefits |  | Other Benefits
| 2018 |  | 2017 |  | 2018 |  | 2017
Amounts recognized in accumulated other comprehensive income: |  |  |  |  |  |  |
Net actuarial loss | $ | 48,744 |  |  | $ | 40,058 |  |  | $ | 25,923 |  |  | $ | 35,672 |
Net prior service cost (credit) | 436 |  |  | 804 |  |  | (10,491 | ) |  | (11,806 | )
Total | $ | 49,180 |  |  | $ | 40,862 |  |  | $ | 15,432 |  |  | $ | 23,866 |
Schedule Of Projected Benefit Obligations In Excess Of Fair Value Of Plan Assets [Table Text Block] | The following table presents information for qualified and non-qualified pension plans with a projected benefit obligation in excess of plan assets as of December 31, 2018 and 2017 (dollars in thousands):
|  | 2018 |  | 2017
Projected benefit obligation |  | $ | 178,604 |  |  | $ | 172,143 |
Fair value of plan assets |  | 102,561 |  |  | 103,236 |
Schedule of Accumulated Benefit Obligations in Excess of Fair Value of Plan Assets [Table Text Block] | The following table presents information for pension plans with an accumulated benefit obligation in excess of plan assets as of December 31, 2018 and 2017 (dollars in thousands):
|  | 2018 |  | 2017
Accumulated benefit obligation |  | $ | 174,400 |  |  | $ | 169,705 |
Fair value of plan assets |  | 102,561 |  |  | 103,236 |
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | The components of net periodic benefit cost, included in other operating expenses on the consolidated statements of income, and other changes in plan assets and benefit obligations recognized in other comprehensive income were as follows (dollars in thousands):
|  | Pension Benefits |  | Other Benefits
|  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 12,502 |  |  | $ | 10,686 |  |  | $ | 10,319 |  |  | $ | 3,028 |  |  | $ | 2,543 |  |  | $ | 2,883 |
Interest cost |  | 5,405 |  |  | 5,326 |  |  | 4,790 |  |  | 2,319 |  |  | 2,118 |  |  | 2,259 |
Expected return on plan assets |  | (7,535 | ) |  | (6,215 | ) |  | (5,138 | ) |  | — |  |  | — |  |  | — |
Amortization of net actuarial losses |  | 3,728 |  |  | 4,382 |  |  | 4,323 |  |  | 2,577 |  |  | 1,992 |  |  | 1,827 |
Amortization of prior service cost (credit) |  | 344 |  |  | 344 |  |  | 294 |  |  | (1,315 | ) |  | (1,315 | ) |  | (622 | )
Settlements |  | — |  |  | 4,785 |  |  | 1,026 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost |  | 14,444 |  |  | 19,308 |  |  | 15,614 |  |  | 6,609 |  |  | 5,338 |  |  | 6,347 |
Other changes in plan assets and benefit obligations recognized in other comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial (gains) losses |  | 12,954 |  |  | 2,633 |  |  | 8,785 |  |  | (7,172 | ) |  | 5,507 |  |  | 6,228 |
Amortization of net actuarial (losses) |  | (3,728 | ) |  | (4,382 | ) |  | (4,323 | ) |  | (2,577 | ) |  | (1,992 | ) |  | (1,827 | )
Amortization of prior service (cost) credit |  | (344 | ) |  | (344 | ) |  | (294 | ) |  | 1,315 |  |  | 1,315 |  |  | 622 |
Settlements |  | — |  |  | (4,785 | ) |  | (1,026 | ) |  | — |  |  | — |  |  | — |
Prior service cost (credit) |  | — |  |  | 159 |  |  | — |  |  | — |  |  | — |  |  | (13,743 | )
Foreign exchange translations and other adjustments |  | (565 | ) |  | 759 |  |  | 707 |  |  | — |  |  | — |  |  | — |
Total recognized in other comprehensive income |  | 8,317 |  |  | (5,960 | ) |  | 3,849 |  |  | (8,434 | ) |  | 4,830 |  |  | (8,720 | )
Total recognized in net periodic benefit cost and other comprehensive income |  | $ | 22,761 |  |  | $ | 13,348 |  |  | $ | 19,463 |  |  | $ | (1,825 | ) |  | $ | 10,168 |  |  | $ | (2,373 | )
Schedule of Expected Benefit Payments [Table Text Block] | The following benefit payments, which reflect expected future service as appropriate, are expected to be paid (dollars in thousands):
|  | Pension Benefits |  | Other Benefits
2019 |  | $ | 9,977 |  |  | $ | 1,528 |
2020 |  | 12,013 |  |  | 1,835 |
2021 |  | 11,663 |  |  | 2,209 |
2022 |  | 14,229 |  |  | 2,633 |
2023 |  | 14,128 |  |  | 3,009 |
2024-2028 |  | 77,832 |  |  | 20,359 |
Schedule of Assumptions Used [Table Text Block] | Weighted average assumptions used to determine the accumulated benefit obligation and net benefit cost or income were as follows:
|  | Pension Benefits |  | Other Benefits
|  | 2018 |  | 2017 |  | 2016 |  | 2018 |  | 2017 |  | 2016
Discount rate used to determine benefit obligation |  | 4.02 | % |  | 3.40 | % |  | 3.80 | % |  | 4.17 | % |  | 3.56 | % |  | 4.10 | %
Discount rate used to determine net benefit cost or income |  | 3.41 | % |  | 3.81 | % |  | 3.95 | % |  | 3.56 | % |  | 4.10 | % |  | 4.43 | %
Expected long-term rate of return on plan assets |  | 7.35 | % |  | 7.35 | % |  | 7.35 | % |  | — | % |  | — | % |  | — | %
Rate of compensation increases |  | 4.17 | % |  | 4.16 | % |  | 4.08 | % |  | — | % |  | — | % |  | — | %
Schedule of Health Care Cost Trend Rates [Table Text Block] | The assumed health care cost trend rates used in measuring the accumulated non-pension post-retirement benefit obligation were as follows:
|  | December 31,
|  | 2018 |  | 2017
Pre-Medicare eligible claims |  | 8% down to 5% in 2024 |  | 9% down to 5% in 2024
Medicare eligible claims |  | 8% down to 5% in 2024 |  | 9% down to 5% in 2024
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] | The assumed health care cost trend rates used in measuring the accumulated non-pension post-retirement benefit obligation were as follows:
|  | December 31,
|  | 2018 |  | 2017
Pre-Medicare eligible claims |  | 8% down to 5% in 2024 |  | 9% down to 5% in 2024
Medicare eligible claims |  | 8% down to 5% in 2024 |  | 9% down to 5% in 2024
Schedule of Allocation of Plan Assets [Table Text Block] | The fair values of the Company’s qualified pension plan assets as of December 31, 2018 and 2017 are summarized below (dollars in thousands):
|  | December 31, 2018
|  |  |  | Fair Value Measurement Using:
|  | Total |  | Level 1 |  | Level 2 |  | Level 3
Mutual Funds(1) |  | $ | 102,414 |  |  | $ | 102,414 |  |  | $ | — |  |  | $ | — |
Cash |  | 147 |  |  | 147 |  |  | — |  |  | — |
Total |  | $ | 102,561 |  |  | $ | 102,561 |  |  | $ | — |  |  | $ | — |
(1) | Mutual funds were invested 25% in U.S. equity funds, 42% in U.S. fixed income funds, 17% in non-U.S. equity funds and 16% in other.
|  | December 31, 2017
|  |  |  | Fair Value Measurement Using:
|  | Total |  | Level 1 |  | Level 2 |  | Level 3
Mutual Funds(2) |  | $ | 103,106 |  |  | $ | 103,106 |  |  | $ | — |  |  | $ | — |
Cash |  | 130 |  |  | 130 |  |  | — |  |  | — |
Total |  | $ | 103,236 |  |  | $ | 103,236 |  |  | $ | — |  |  | $ | — |
(2) | Mutual funds were invested 27% in U.S. equity funds, 36% in U.S. fixed income funds, 22% in non-U.S. equity funds and 15% in other.

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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