| **Consolidated Statements of Cash Flows - USD ($) $ in Thousands**                    | 12 Months Ended |
|---------------------------------------------------------------------------------------|-----------------|
||
| **Cash flows from operating activities:**                                             |            |   |   |
| Net income                                                                            | $ 249,539       | $ 337,091 | $ 377,375 |
| **Adjustments to reconcile net income to net cash provided by operating activities:** |            |   |   |
| Depreciation                                                                          | 56,323          | 55,454 | 52,959 |
| Amortization                                                                          | 56,979          | 54,790 | 55,448 |
| Provision for losses on receivables                                                   | 2,165           | 2,254 | 1,185 |
| Deferred income taxes                                                                 | (13,956)        | (1,018) | (33,949) |
| Non-cash stock compensation                                                           | 12,856          | 18,086 | 21,550 |
| Loss on sale of property, plant and equipment                                         | 484             | 953 | 830 |
| Impairment loss on assets held for sale                                               | 87,371          | 0 | 0 |
| Other non-cash                                                                        | 3,729           | (669) | 1,359 |
| **Changes in operating assets and liabilities:**                                      |            |   |   |
| Receivables                                                                           | 50,098          | (39,992) | 10,236 |
| Inventories                                                                           | 5,785           | (23,117) | 5,532 |
| Prepaid expenses                                                                      | 1,978           | (2,024) | (4,046) |
| Accounts payable                                                                      | (10,673)        | 654 | (2,671) |
| Income taxes payable                                                                  | (7,816)         | (3,832) | (2,718) |
| Accrued liabilities                                                                   | 6,360           | (14,027) | 2,134 |
| Customer advance payments                                                             | (619)           | 2,193 | 5,047 |
| Other net                                                                             | 1,818           | (3,903) | 14,367 |
| Net cash provided by operating activities                                             | 502,421         | 382,893 | 504,638 |
| **Cash flows from investing activities:**                                             |            |   |   |
| Additions to property, plant and equipment                                            | (50,535)        | (64,244) | (89,790) |
| Proceeds from sale of property, plant and equipment                                   | 840             | 1,285 | 458 |
| Acquisition of businesses, net of cash acquired                                       | (142,414)       | (12,486) | (50,586) |
| Other                                                                                 | (2,000)         | (844) | 0 |
| Net cash used in investing activities                                                 | (194,109)       | (76,289) | (139,918) |
| **Cash flows from financing activities:**                                             |            |   |   |
| Proceeds from short-term borrowings                                                   | 0               | 0 | 996 |
| Repayment of short-term borrowings                                                    | 0               | 0 | (1,006) |
| Proceeds from long-term debt                                                          | 165,734         | 186,635 | 585,661 |
| Repayment of long-term debt                                                           | (319,550)       | (254,473) | (854,538) |
| Repayment of capital lease obligations                                                | (7,605)         |   |   |
| Repayment of capital lease obligations                                                |            | (4,859) | (5,333) |
| Payment of debt issuance costs                                                        | 0               | (1,742) | (1,826) |
| Issuance of common shares                                                             | 50,853          | 26,020 | 18,811 |
| Purchase of treasury shares                                                           | (52,614)        | (120,510) | (24,012) |
| Dividends paid                                                                        | (88,347)        | (82,145) | (72,443) |
| Net cash used in financing activities                                                 | (251,529)       | (251,074) | (353,690) |
| Effect of exchange rate changes on cash                                               | 346             | (44) | (5,735) |
| Increase in cash and cash equivalents                                                 | 57,129          | 55,486 | 5,295 |
| Cash and cash equivalents at beginning of year                                        | 151,164         | 95,678 | 90,383 |
| Cash and cash equivalents at end of year                                              | $ 208,293       | $ 151,164 | $ 95,678 |

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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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Amount of cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including, but not limited to, disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.
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Amount of increase (decrease) in cash, cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; including effect from exchange rate change. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.
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Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.
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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 effect of exchange rate changes on cash and cash equivalents, and cash and cash equivalents restricted to withdrawal or usage; held in foreign currencies. Excludes amounts for disposal group and discontinued operations. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, 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.
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Amount of cash outflow for principal payment on finance lease.
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Amount of gain (loss) on sale or disposal of property, plant and equipment assets, including oil and gas property and timber property.
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Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.
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The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.
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The increase (decrease) during the reporting period in the amount of outstanding money paid in advance for goods or services that bring economic benefits for future periods.
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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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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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Other cash or noncash adjustments to reconcile net income to cash provided by (used in) operating activities that are not separately disclosed in the statement of cash flows (for example,  cash received or cash paid during the current period for miscellaneous operating activities, net change during the reporting period in other assets or other liabilities).
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| - Definition
Amount of cash (inflow) outflow from investing activities classified as other.
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| - Definition
The cash outflow to reacquire common stock during the period.
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| - Definition
The cash outflow paid to third parties in connection with debt origination, which will be amortized over the remaining maturity period of the associated long-term debt.
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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
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 cash inflow from the additional capital contribution to the entity.
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| - Definition
The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.
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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 cash inflow from a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.
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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.
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| - Definition
Amount of expense (reversal of expense) for expected credit loss on accounts receivable.
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| - Definition
The cash outflow for the obligation for a lease meeting the criteria for capitalization (with maturities exceeding one year or beyond the operating cycle of the entity, if longer).
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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.
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| - Definition
The cash outflow for a borrowing having initial term of repayment within one year or the normal operating cycle, if longer.
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| - Definition
Amount of noncash expense for share-based payment arrangement.
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