CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
OPERATING ACTIVITIES
Net income	$ 12,239us-gaap_ProfitLoss	$ 10,693us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	13,524us-gaap_Depreciation	14,107us-gaap_Depreciation
Amortization	1,830us-gaap_AdjustmentForAmortization	1,801us-gaap_AdjustmentForAmortization
Change in long-term liabilities, deferred taxes and other credits	(277)	(214)
Provision for write-off of property, plant and equipment	152	1
Gain on disposition of assets	(1,056)
Excess tax benefit of options exercised	(261)	(39)
Compensation and benefits paid or payable in Class A Common Stock	576us-gaap_RestrictedStockExpense	542us-gaap_RestrictedStockExpense
Changes in operating assets and liabilities that provide/(use) cash:
Accounts receivable	(13,699)	10,964
Inventories	(3,070)us-gaap_IncreaseDecreaseInInventories	(8,996)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	(2,705)	(2,148)
Income taxes prepaid and receivable	84	21
Accounts payable	3,512	(1,294)
Accrued liabilities	(1,587)	(12,849)
Income taxes payable	(398)	(1,710)
Other, net	(2,455)	(2,031)
Net cash provided by operating activities	6,409	8,848
INVESTING ACTIVITIES
Purchases of property, plant and equipment	(12,211)	(14,603)
Purchased software	(33)us-gaap_PaymentsToAcquireSoftware	(294)us-gaap_PaymentsToAcquireSoftware
Proceeds from sale of assets	2,797
Net cash used in investing activities	(9,447)	(14,897)
FINANCING ACTIVITIES
Proceeds from borrowings	15,274us-gaap_ProceedsFromIssuanceOfDebt	4,435us-gaap_ProceedsFromIssuanceOfDebt
Principal payments on debt	(5,443)us-gaap_RepaymentsOfDebt	(6,516)us-gaap_RepaymentsOfDebt
Proceeds from options exercised	685	126
Excess tax benefit of options exercised	261	39
Dividends paid	(5,098)us-gaap_PaymentsOfDividends	(4,765)us-gaap_PaymentsOfDividends
Net cash provided by/(used in) financing activities	5,679	(6,681)
Effect of exchange rate changes on cash and cash equivalents	(11,605)	(1,557)
Decrease in cash and cash equivalents	(8,964)	(14,287)
Cash and cash equivalents at beginning of period	179,802	222,666
Cash and cash equivalents at end of period	$ 170,838	$ 208,379

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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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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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The increase (decrease) during the reporting period of all taxes owed but not paid, including income, property and other taxes.

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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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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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