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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Cash Flows from Operating Activities |  |  |
Net earnings | $ 73,646 us-gaap_NetIncomeLoss | $ 113,295 us-gaap_NetIncomeLoss | $ 123,908 us-gaap_NetIncomeLoss
Adjustments to arrive at net cash provided by operating activities: |  |  |
Depreciation and amortization | 51,456 us-gaap_DepreciationDepletionAndAmortization | 52,016 us-gaap_DepreciationDepletionAndAmortization | 48,352 us-gaap_DepreciationDepletionAndAmortization
Share-based compensation | 6,265 us-gaap_ShareBasedCompensation | 8,430 us-gaap_ShareBasedCompensation | 10,086 us-gaap_ShareBasedCompensation
Loss (gain) on assets | 70,745 us-gaap_GainLossOnDispositionOfAssets | 695 us-gaap_GainLossOnDispositionOfAssets | (869)us-gaap_GainLossOnDispositionOfAssets
Deferred income taxes | (16,780)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | (6,178)us-gaap_IncreaseDecreaseInDeferredIncomeTaxes | 2,916 us-gaap_IncreaseDecreaseInDeferredIncomeTaxes
Changes in operating assets and liabilities: |  |  |
Trade accounts receivable | (10,582)us-gaap_IncreaseDecreaseInAccountsReceivable | 3,466 us-gaap_IncreaseDecreaseInAccountsReceivable | (15,158)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories | 64 us-gaap_IncreaseDecreaseInInventories | (30,217)us-gaap_IncreaseDecreaseInInventories | (23,125)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets | 6,479 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 616 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (9,405)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable and other accrued expenses | 6,745 us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities | 3,606 us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities | 225 us-gaap_IncreaseDecreaseInOtherAccountsPayableAndAccruedLiabilities
Accrued salaries, wages and withholdings from employees | (365)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities | 5,384 us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities | (1,209)us-gaap_IncreaseDecreaseInEmployeeRelatedLiabilities
Income taxes | 7,047 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | (100)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | (1,689)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Other liabilities | (5,532)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | 2,540 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | 5,334 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash provided by operating activities | 189,188 us-gaap_NetCashProvidedByUsedInOperatingActivities | 153,553 us-gaap_NetCashProvidedByUsedInOperatingActivities | 139,366 us-gaap_NetCashProvidedByUsedInOperatingActivities
Cash Flows from Investing Activities |  |  |
Acquisition of property, plant and equipment | (79,398)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (104,246)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (103,806)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Proceeds from sale of assets | 1,029 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 6,225 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 1,364 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Other investing activities | (780)us-gaap_PaymentsForProceedsFromOtherInvestingActivities | (208)us-gaap_PaymentsForProceedsFromOtherInvestingActivities | (242)us-gaap_PaymentsForProceedsFromOtherInvestingActivities
Net cash used in investing activities | (79,149)us-gaap_NetCashProvidedByUsedInInvestingActivities | (98,229)us-gaap_NetCashProvidedByUsedInInvestingActivities | (102,684)us-gaap_NetCashProvidedByUsedInInvestingActivities
Cash Flows from Financing Activities |  |  |
Proceeds from additional borrowings | 213,985 us-gaap_ProceedsFromIssuanceOfDebt | 194,973 us-gaap_ProceedsFromIssuanceOfDebt | 73,903 us-gaap_ProceedsFromIssuanceOfDebt
Debt payments | (128,186)us-gaap_RepaymentsOfDebt | (198,686)us-gaap_RepaymentsOfDebt | (58,052)us-gaap_RepaymentsOfDebt
Purchase of treasury stock | (137,192)us-gaap_PaymentsForRepurchaseOfCommonStock | 0 us-gaap_PaymentsForRepurchaseOfCommonStock | (23,154)us-gaap_PaymentsForRepurchaseOfCommonStock
Dividends paid | (47,893)us-gaap_PaymentsOfDividendsCommonStock | (45,513)us-gaap_PaymentsOfDividendsCommonStock | (43,426)us-gaap_PaymentsOfDividendsCommonStock
Proceeds from options exercised and other equity transactions | 733 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | 1,007 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | 1,957 us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Net cash used in financing activities | (98,553)us-gaap_NetCashProvidedByUsedInFinancingActivities | (48,219)us-gaap_NetCashProvidedByUsedInFinancingActivities | (48,772)us-gaap_NetCashProvidedByUsedInFinancingActivities
Effect of exchange rate changes on cash and cash equivalents | (10,993)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | (2,331)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | 4,297 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
Net increase (decrease) in cash and cash equivalents | 493 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | 4,774 us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (7,793)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of period | 19,836 us-gaap_CashAndCashEquivalentsAtCarryingValue | 15,062 us-gaap_CashAndCashEquivalentsAtCarryingValue | 22,855 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of period | 20,329 us-gaap_CashAndCashEquivalentsAtCarryingValue | 19,836 us-gaap_CashAndCashEquivalentsAtCarryingValue | 15,062 us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash paid during the year for: |  |  |
Interest | 16,158 us-gaap_InterestPaid | 16,168 us-gaap_InterestPaid | 16,897 us-gaap_InterestPaid
Income taxes | 42,335 us-gaap_IncomeTaxesPaid | 47,436 us-gaap_IncomeTaxesPaid | 53,492 us-gaap_IncomeTaxesPaid
Capitalized interest | $ 1,449 us-gaap_InterestPaidCapitalized | $ 1,875 us-gaap_InterestPaidCapitalized | $ 1,601 us-gaap_InterestPaidCapitalized

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- Definition The net cash outflow or inflow from other investing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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- Definition The cash outflow to reacquire common stock during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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- Definition Amount of cash outflow in the form of ordinary dividends to common shareholders of the parent entity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 13 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585 + Details
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- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References No definition available. + Details
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- Definition The net cash inflow or outflow from other financing activities. This element is used when there is not a more specific and appropriate element in the taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3095-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3098-108585 + Details
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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Investing Activities -URI http://asc.fasb.org/extlink&oid=6516133 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3179-108585 + Details
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- Definition The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations. + References No definition available. + Details
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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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 + Details
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