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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2015
Compensation and Retirement Disclosure [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, 2015 and 2014 is summarized below (dollars in thousands):
|  | December 31,
|  | Pension Benefits |  | Other Benefits
|  | 2015 |  | 2014 |  | 2015 |  | 2014
Change in benefit obligation: |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 138,196 |  |  | $ | 111,195 |  |  | $ | 59,782 |  |  | $ | 30,759 |
Service cost |  | 9,222 |  |  | 8,121 |  |  | 4,062 |  |  | 2,354 |
Interest Cost |  | 5,035 |  |  | 4,972 |  |  | 2,572 |  |  | 1,962 |
Participant contributions |  | — |  |  | — |  |  | 229 |  |  | 174 |
Actuarial (gains) losses |  | (1,919 | ) |  | 18,930 |  |  | (2,729 | ) |  | 25,354 |
Benefits paid |  | (4,480 | ) |  | (3,044 | ) |  | (609 | ) |  | (821 | )
Foreign exchange translations and other adjustments |  | (3,815 | ) |  | (1,978 | ) |  | — |  |  | — |
Benefit obligation at end of year |  | $ | 142,239 |  |  | $ | 138,196 |  |  | $ | 63,307 |  |  | $ | 59,782 |
Schedule of Changes in Fair Value of Plan Assets [Table Text Block] |
|  | December 31,
|  | Pension Benefits |  | Other Benefits
|  | 2015 |  | 2014 |  | 2015 |  | 2014
Change in plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets at beginning of year |  | $ | 66,757 |  |  | $ | 59,559 |  |  | $ | — |  |  | $ | — |
Actual return on plan assets |  | (2,795 | ) |  | 2,489 |  |  | — |  |  | — |
Employer contributions |  | 8,953 |  |  | 7,753 |  |  | 380 |  |  | 647 |
Participant contributions |  | — |  |  | — |  |  | 229 |  |  | 174 |
Benefits paid and expenses |  | (4,480 | ) |  | (3,044 | ) |  | (609 | ) |  | (821 | )
Fair value of plan assets at end of year |  | $ | 68,435 |  |  | $ | 66,757 |  |  | $ | — |  |  | $ | — |
Funded status at end of year |  | $ | (73,804 | ) |  | $ | (71,439 | ) |  | $ | (63,307 | ) |  | $ | (59,782 | )
Schedule of Net Funded Status [Table Text Block] |
|  | December 31,
|  | Qualified Plans |  | Non-Qualified Plans(1) |  | Total
|  | 2015 |  | 2014 |  | 2015 |  | 2014 |  | 2015 |  | 2014
Aggregate fair value of plan assets |  | $ | 68,435 |  |  | $ | 66,757 |  |  | $ | — |  |  | $ | — |  |  | $ | 68,435 |  |  | $ | 66,757 |
Aggregate projected benefit obligations |  | 83,870 |  |  | 80,104 |  |  | 58,369 |  |  | 58,092 |  |  | 142,239 |  |  | 138,196 |
Under funded |  | $ | (15,435 | ) |  | $ | (13,347 | ) |  | $ | (58,369 | ) |  | $ | (58,092 | ) |  | $ | (73,804 | ) |  | $ | (71,439 | )
(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
| 2015 |  | 2014 |  | 2015 |  | 2014
Amounts recognized in accumulated other comprehensive income: |  |  |  |  |  |  |
Net actuarial loss | $ | 41,814 |  |  | $ | 41,238 |  |  | $ | 27,755 |  |  | $ | 32,949 |
Net prior service cost | 1,159 |  |  | 1,496 |  |  | — |  |  | — |
Total | $ | 42,973 |  |  | $ | 42,734 |  |  | $ | 27,755 |  |  | $ | 32,949 |
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, 2015 and 2014 (dollars in thousands):
|  | 2015 |  | 2014
Projected benefit obligation |  | $ | 142,239 |  |  | $ | 138,196 |
Fair value of plan assets |  | 68,435 |  |  | 66,757 |
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, 2015 and 2014 (dollars in thousands):
|  | 2015 |  | 2014
Accumulated benefit obligation |  | $ | 140,442 |  |  | $ | 135,850 |
Fair value of plan assets |  | 68,435 |  |  | 66,757 |
Schedule of Defined Benefit Plan Amounts Recognized in Other Comprehensive Income (Loss) [Table Text Block] | The components of net periodic benefit cost and other changes in plan assets and benefit obligations recognized in other comprehensive income were as follows (dollars in thousands):
|  | Pension Benefits |  | Other Benefits
|  | 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013
Net periodic benefit cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 9,222 |  |  | $ | 8,121 |  |  | $ | 8,023 |  |  | $ | 4,062 |  |  | $ | 2,354 |  |  | $ | 1,881 |
Interest cost |  | 5,035 |  |  | 4,972 |  |  | 4,072 |  |  | 2,572 |  |  | 1,962 |  |  | 1,353 |
Expected return on plan assets |  | (4,897 | ) |  | (4,471 | ) |  | (3,734 | ) |  | — |  |  | — |  |  | — |
Amortization of prior actuarial losses |  | 3,429 |  |  | 1,755 |  |  | 3,270 |  |  | 2,465 |  |  | 1,060 |  |  | 868 |
Amortization of prior service cost |  | 309 |  |  | 333 |  |  | 373 |  |  | — |  |  | — |  |  | — |
Net periodic benefit cost |  | 13,098 |  |  | 10,710 |  |  | 12,004 |  |  | 9,099 |  |  | 5,376 |  |  | 4,102 |
Other changes in plan assets and benefit obligations recognized in other comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial (gains) losses |  | 5,774 |  |  | 20,912 |  |  | (11,250 | ) |  | (2,729 | ) |  | 25,354 |  |  | (5,949 | )
Amortization of actuarial (gains) losses |  | (3,429 | ) |  | (1,755 | ) |  | (3,270 | ) |  | (2,465 | ) |  | (1,060 | ) |  | (868 | )
Amortization of prior service cost (credit) |  | (309 | ) |  | (333 | ) |  | (373 | ) |  | — |  |  | — |  |  | — |
Foreign exchange translations and other adjustments |  | (1,797 | ) |  | (578 | ) |  | (439 | ) |  | — |  |  | — |  |  | — |
Total recognized in other comprehensive income |  | 239 |  |  | 18,246 |  |  | (15,332 | ) |  | (5,194 | ) |  | 24,294 |  |  | (6,817 | )
Total recognized in net periodic benefit cost and other comprehensive income |  | $ | 13,337 |  |  | $ | 28,956 |  |  | $ | (3,328 | ) |  | $ | 3,905 |  |  | $ | 29,670 |  |  | $ | (2,715 | )
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
2016 |  | $ | 10,993 |  |  | $ | 753 |
2017 |  | 8,228 |  |  | 913 |
2018 |  | 8,141 |  |  | 1,095 |
2019 |  | 10,200 |  |  | 1,281 |
2020 |  | 9,533 |  |  | 1,535 |
2021-2025 |  | 57,489 |  |  | 11,534 |
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
|  | 2015 |  | 2014 |  | 2013 |  | 2015 |  | 2014 |  | 2013
Discount rate used to determine benefit obligation |  | 3.99 | % |  | 3.90 | % |  | 4.45 | % |  | 4.43 | % |  | 4.05 | % |  | 5.05 | %
Discount rate used to determine net benefit cost or income |  | 3.77 | % |  | 4.30 | % |  | 3.83 | % |  | 4.05 | % |  | 5.05 | % |  | 4.15 | %
Expected long-term rate of return on plan assets |  | 7.35 | % |  | 7.35 | % |  | 7.35 | % |  | — | % |  | — | % |  | — | %
Rate of compensation increases |  | 4.08 | % |  | 4.08 | % |  | 4.21 | % |  | — | % |  | — | % |  | — | %
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,
|  | 2015 |  | 2014
Pre-Medicare eligible claims |  | 8% down to 5% in 2020 |  | 8% down to 5% in 2018
Medicare eligible claims |  | 8% down to 5% in 2020 |  | 8% down to 5% in 2018
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block] | A one-percentage point change in assumed health care cost trend rates would have the following effects (dollars in thousands):
|  | One Percent Increase |  | One Percent Decrease
Effect on total of service and interest cost components |  | $ | 1,694 |  |  | $ | (1,226 | )
Effect on accumulated postretirement benefit obligation |  | $ | 13,659 |  |  | $ | (10,254 | )
Schedule of Allocation of Plan Assets [Table Text Block] | The fair values of the Company’s pension plan assets as of December 31, 2015 and 2014 are summarized below (dollars in thousands):
|  | December 31, 2015
|  |  |  | Fair Value Measurement Using:
|  | Total |  | Level 1 |  | Level 2 |  | Level 3
Mutual Funds(1) |  | $ | 68,349 |  |  | $ | 68,349 |  |  | $ | — |  |  | $ | — |
Cash |  | 86 |  |  | 86 |  |  | — |  |  | — |
Total |  | $ | 68,435 |  |  | $ | 68,435 |  |  | $ | — |  |  | $ | — |
(1) | Mutual funds were invested 32% in U.S. equity funds, 38% in U.S. fixed income funds, 15% in non-U.S. equity funds and 15% in other.
|  | December 31, 2014
|  |  |  | Fair Value Measurement Using:
|  | Total |  | Level 1 |  | Level 2 |  | Level 3
Mutual Funds(2) |  | $ | 66,675 |  |  | $ | 66,675 |  |  | $ | — |  |  | $ | — |
Cash |  | 82 |  |  | 82 |  |  | — |  |  | — |
Total |  | $ | 66,757 |  |  | $ | 66,757 |  |  | $ | — |  |  | $ | — |
(2) | Mutual funds were invested 32% in U.S. equity funds, 30% in U.S. fixed income funds, 22% in non-U.S. equity funds and 16% in other.

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- Definition Tabular disclosure of accumulated benefit obligations and fair values of plan assets of pension plans and/or other employee benefit plans where the accumulated benefit obligation exceeds the fair value of plan assets. + References Reference 1: 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 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + 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 (i) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + 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) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the reconciliation of beginning and ending balances of the fair value of plan assets of pension plans and/or other employee benefit plans showing separately, if applicable, the effects during the period attributable to each of the following: actual return on plan assets, foreign currency exchange rate changes, contributions by the employer, contributions by plan participants, benefits paid, business combinations, divestitures, and settlements. + 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) -URI http://asc.fasb.org/extlink&oid=58740216&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans 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 benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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=58740216&loc=d3e1928-114920 + Details
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