| **Consolidated Condensed Statements of Cash Flows - USD ($) $ in Thousands** | 3 Months Ended |
|------------------------------------------------------------------------------|----------------|
||
| **Cash flows from operating activities:**                                    |           |   |
| Net earnings                                                                 | $ 21,190       | $ 26,737 |
| Depreciation                                                                 | 7,883          | 7,744 |
| Amortization                                                                 | 6,150          | 6,256 |
| Other noncash items                                                          | 142            | 79 |
| Net loss on disposition of assets                                            | 388            | 49 |
| Stock-based compensation expense                                             | 2,366          | 3,147 |
| Excess tax benefit from stock-based compensation                             | (38)           | (600) |
| Change in assets and liabilities                                             | 22,901         | (24,806) |
| Net cash provided by operating activities                                    | 60,982         | 18,606 |
| **Cash flows from investing activities:**                                    |           |   |
| Restricted cash                                                              | (51)           | 0 |
| Business acquisitions, net of cash acquired                                  | (10,914)       | (20,881) |
| Additions to plant assets                                                    | (8,485)        | (21,007) |
| Proceeds from disposition of plant assets                                    | 5              | 56 |
| Net cash used in investing activities                                        | (19,445)       | (41,832) |
| **Cash flows from financing activities:**                                    |           |   |
| Net borrowings on revolving credit facility                                  | 1,000          | 28,000 |
| Payments on long-term debt                                                   | (72)           | 0 |
| Sale of capital stock under stock option and employee purchase plans         | 1,470          | 3,462 |
| Payments for repurchase of common stock                                      | (31,006)       | (7,949) |
| Excess tax benefit from stock-based compensation                             | 38             | 600 |
| Dividend paid to noncontrolling interests                                    | 0              | (206) |
| Cash dividends paid                                                          | (10,750)       | (10,068) |
| Net cash (used in) provided by financing activities                          | (39,320)       | 13,839 |
| Net effect of exchange rate changes on cash                                  | 887            | (324) |
| Net change in cash and cash equivalents                                      | 3,104          | (9,711) |
| Cash and cash equivalents, beginning of period                               | 101,529        | 94,064 |
| Cash and cash equivalents, end of period                                     | 104,633        | 84,353 |
| **Cash paid during the period for:**                                         |           |   |
| Interest                                                                     | 1,653          | 1,201 |
| Income taxes, net of refunds                                                 | $ 2,948        | $ 3,638 |

| X                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                     |
|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate amount of recurring noncash expense charged against earnings in the period to allocate the cost of assets over their estimated remaining economic lives.
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.
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|---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase (decrease) in cash and cash equivalents. Cash and cash equivalents are the amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Includes effect from exchange rate changes.
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| - Definition
The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.
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Amount of increase (decrease) from the effect of exchange rate changes on cash and cash equivalent balances held in foreign currencies.
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| - Definition
Amount of cash inflow from realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.
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| - Definition
Amount of cash outflow for realized tax benefit related to deductible compensation cost reported on the entity's tax return for equity instruments in excess of the compensation cost for those instruments recognized for financial reporting purposes.
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| - Definition
Amount of gain (loss) on sale or disposal of property, plant and equipment assets, excluding oil and gas property and timber property.
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| - Definition
The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.
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| - Definition
Amount of increase (decrease) in operating assets after deduction of operating liabilities classified as other.
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| - Definition
The net cash inflow or outflow for the increase (decrease) associated with funds that are not available for withdrawal or use (such as funds held in escrow) and are associated with underlying transactions that are classified as investing activities.
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The amount of cash paid for interest during the period net of cash paid for interest that is capitalized.
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| - Definition
Amount of cash inflow (outflow) from financing activities, including discontinued operations. Financing activity cash flows include obtaining resources from owners and providing them with a return on, and a return of, their investment; borrowing money and repaying amounts borrowed, or settling the obligation; and obtaining and paying for other resources obtained from creditors on long-term credit.
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| - Definition
Amount of cash inflow (outflow) from investing activities, including discontinued operations. Investing activity cash flows include making and collecting loans and acquiring and disposing of debt or equity instruments and property, plant, and equipment and other productive assets.
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| - Definition
Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.
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Amount of income (expense) included in net income that results in no cash inflow (outflow), classified as other.
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| - Definition
The cash outflow to reacquire common stock during the period.
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| - Definition
Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity.
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| - Definition
Amount of cash outflow in the form of ordinary dividends provided by the non-wholly owned subsidiary to noncontrolling interests.
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| - Definition
The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.
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| - Definition
The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.
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| - Definition
The total cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards, including stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.
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| - Definition
Amount of cash inflow (outflow) from long-term debt, including capital lease obligations and mandatory redeemable capital securities.
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| - Definition
The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.
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|--------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The consolidated profit or loss for the period, net of income taxes, including the portion attributable to the noncontrolling interest.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.
+ References
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|----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.
+ References
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| - References
No definition available.
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