| **Pension and Other Postretirement Plans (Narrative) (Details) - USD ($) $ in Thousands**                                                                                                                                         |     | 12 Months Ended |            |
|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-----|-----------------|------------|
||
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                                                  |     |            |       |   |   |   |
| Effect of plan disposal on projected benefit obligation and pension liability                                                                                                                                                     |     |            | $ (36,273) |   |   |   |
| Pension Benefits [Member]                                                                                                                                                                                                         |     |            |       |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                                                  |     |            |       |   |   |   |
| Effect of plan disposal on projected benefit obligation and pension liability                                                                                                                                                     | [1] |            | (637)      |   |   |   |
| Pension Benefits [Member] | J.L. Clark, Inc [Member]                                                                                                                                                                              |     |            |       |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                                                  |     |            |       |   |   |   |
| Effect of plan disposal on projected benefit obligation and pension liability                                                                                                                                                     |     |            | 3,988      |   |   |   |
| United States Pension Plans of US Entity, Defined Benefit [Member]                                                                                                                                                                |     |            |       |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                                                  |     |            |       |   |   |   |
| Voluntary contributions                                                                                                                                                                                                           |     |            | $ 0        | $ 0 | $ 1,493 |   |
| United States Pension Plans of US Entity, Defined Benefit [Member] | Equity Securities [Member]                                                                                                                                   |     |            |       |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                                                  |     |            |       |   |   |   |
| Target plan asset allocations                                                                                                                                                                                                     |     |            | 40.00%     |   |   |   |
| United States Pension Plans of US Entity, Defined Benefit [Member] | Debt Securities [Member]                                                                                                                                     |     |            |       |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                                                  |     |            |       |   |   |   |
| Target plan asset allocations                                                                                                                                                                                                     |     |            | 60.00%     |   |   |   |
| United States Pension Plans of US Entity, Defined Benefit [Member] | Qualified Pension Plans [Member]                                                                                                                             |     |            |       |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                                                  |     |            |       |   |   |   |
| Estimated employer contributions in next fiscal year                                                                                                                                                                              |     |            | $ 0        |   |   |   |
| Defined benefit plan effect on next fiscal year net periodic benefit cost from changes in assumptions                                                                                                                             |     |            | 898        |   |   |   |
| United States Pension Plans of US Entity, Defined Benefit [Member] | Qualified Pension Plans [Member] | Pension Benefits [Member] | J.L. Clark, Inc [Member]                                                                      |     |            |       |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                                                  |     |            |       |   |   |   |
| Effect of plan disposal on projected benefit obligation and pension liability                                                                                                                                                     |     | $ 3,988         |       |   |   |   |
| United States Pension Plans of US Entity, Defined Benefit [Member] | Nonqualified Pension Plans [Member]                                                                                                                          |     |            |       |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                                                  |     |            |       |   |   |   |
| Estimated employer contributions in next fiscal year                                                                                                                                                                              |     |            | 159        |   |   |   |
| Aggregate projected benefit obligation                                                                                                                                                                                            |     |            | 2,041      |   |   |   |
| Aggregate accumulated benefit obligation                                                                                                                                                                                          |     |            | 1,954      |   |   |   |
| Restricted trust, included in Other noncurrent assets                                                                                                                                                                             |     |            | 729        | 893 |   |   |
| Defined benefit plan, benefit obligation                                                                                                                                                                                          |     |            | $ 2,041    | 2,358 |   |   |
| Next fiscal year assumptions for calculating net periodic benefit cost, discount rate                                                                                                                                             |     |            | 3.25%      |   |   |   |
| Defined benefit plan effect on next fiscal year net periodic benefit cost from changes in assumptions                                                                                                                             |     |            | $ (44)     |   |   |   |
| Foreign Pension Plans, Defined Benefit [Member]                                                                                                                                                                                   |     |            |       |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                                                  |     |            |       |   |   |   |
| Estimated employer contributions in next fiscal year                                                                                                                                                                              |     |            | 384        |   |   |   |
| Other Postretirement Benefit Plans, Defined Benefit [Member]                                                                                                                                                                      |     |            |       |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                                                  |     |            |       |   |   |   |
| Estimated employer contributions in next fiscal year                                                                                                                                                                              |     |            | 45         |   |   |   |
| Defined benefit plan, benefit obligation                                                                                                                                                                                          |     |            | $ 341      | 397 | 356 |   |
| Next fiscal year assumptions for calculating net periodic benefit cost, discount rate                                                                                                                                             |     |            | 3.25%      |   |   |   |
| Unrecognized net prior service credit                                                                                                                                                                                             |     |            | $ (350)    | (473) |   | $ 1,708 |
| Pension Plan [Member]                                                                                                                                                                                                             |     |            |       |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                                                  |     |            |       |   |   |   |
| Defined benefit plan, benefit obligation                                                                                                                                                                                          |     |            | 195,516    | 204,982 | $ 176,099 |   |
| Unrecognized net prior service credit                                                                                                                                                                                             |     |            | 1          | $ (2) |   |   |
| Pension Plan [Member] | Qualified Pension Plans [Member]                                                                                                                                                                          |     |            |       |   |   |   |
| **Defined Benefit Plan Disclosure [Line Items]**                                                                                                                                                                                  |     |            |       |   |   |   |
| Aggregate projected benefit obligation                                                                                                                                                                                            |     |            | 193,475    |   |   |   |
| Aggregate accumulated benefit obligation                                                                                                                                                                                          |     |            | 189,895    |   |   |   |
| Aggregate fair value of plan assets                                                                                                                                                                                               |     |            | $ 164,488  |   |   |   |
| Next fiscal year assumptions for calculating net periodic benefit cost, long term return on plat assets                                                                                                                           |     |            | 6.50%      |   |   |   |
| Next fiscal year assumptions for calculating net periodic benefit cost, discount rate                                                                                                                                             |     |            | 4.00%      |   |   |   |
|                                                                                                                                                                                                                                   |
| [1]Includes gains of $3,988 related to a curtailment and re-measurement of the assets and liabilities of the Company's qualified U.S. pension plan resulting from the disposal of J.L. Clark. See Note L for related information. |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                  |
|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Defined Benefit Plan Effect on Next Fiscal Year Net Periodic Benefit Cost From Changes in Assumptions -- The changes in the fair value of plan assets and in the assumptions will result in a net increase in the next fiscal year expense unless the Company makes contributions to the plans in the next fiscal year.
+ References
No definition available.
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| - Definition
Defined Benefit Plan, Next Fiscal Year Assumptions for Calculating Net Periodic Benefit Cost, Discount Rate -- The interest rate used to adjust for the time value of money.
+ References
No definition available.
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| - Definition
Defined Benefit Plan Next Fiscal Year Assumptions For Calculating Net Periodic Benefit Cost Expected Long Term Return On Assets -- An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.
+ References
No definition available.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.
+ References
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date.  2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.
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| - Definition
Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
+ References
No definition available.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.
+ References
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|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
If aggregate disclosures are presented, the aggregate fair value of plan assets for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.
+ References
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.
+ References
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| - Definition
Target allocation of investments of this type to total plan assets presented on a weighted average basis.
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| - Definition
Amount of employer's best estimate of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position.
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| - Definition
Amount before tax and reclassification adjustments of other comprehensive income (loss).
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| - Definition
The amount of cash or cash equivalents contributed during the reporting period by the entity to fund its pension plans and its non-pension postretirement benefit plans.
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| - Definition
Amount of investments in debt and equity securities and other forms of securities that provide ownership interests classified as trading.
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