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CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
CASH FLOWS FROM OPERATING ACTIVITIES: |  |  |
Net income | $ 22,974 us-gaap_ProfitLoss | $ 16,570 us-gaap_ProfitLoss | $ 19,710 us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Depreciation and amortization | 35,929 us-gaap_DepreciationDepletionAndAmortization | 32,542 us-gaap_DepreciationDepletionAndAmortization | 22,534 us-gaap_DepreciationDepletionAndAmortization
Losses on sales and/or abandonment of property and equipment | 916 mmsi_LossOnSaleAndOrAbandonmentOfPropertyAndEquipment | 177 mmsi_LossOnSaleAndOrAbandonmentOfPropertyAndEquipment | 204 mmsi_LossOnSaleAndOrAbandonmentOfPropertyAndEquipment
Write-off of patents and intangible assets | 1,427 us-gaap_ImpairmentOfIntangibleAssetsFinitelived | 8,208 us-gaap_ImpairmentOfIntangibleAssetsFinitelived | 55 us-gaap_ImpairmentOfIntangibleAssetsFinitelived
Impairment of cost-method investment | 0 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment | 0 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment | 2,368 us-gaap_CostmethodInvestmentsOtherThanTemporaryImpairment
Acquired in-process research and development | 0 us-gaap_ResearchAndDevelopmentAssetAcquiredOtherThanThroughBusinessCombinationWrittenOff | 0 us-gaap_ResearchAndDevelopmentAssetAcquiredOtherThanThroughBusinessCombinationWrittenOff | 2,450 us-gaap_ResearchAndDevelopmentAssetAcquiredOtherThanThroughBusinessCombinationWrittenOff
Amortization of deferred credits | (175)us-gaap_OtherAmortizationOfDeferredCharges | (139)us-gaap_OtherAmortizationOfDeferredCharges | (174)us-gaap_OtherAmortizationOfDeferredCharges
Amortization of long-term debt issuance costs | 987 us-gaap_AmortizationOfFinancingCosts | 845 us-gaap_AmortizationOfFinancingCosts | 0 us-gaap_AmortizationOfFinancingCosts
Realized gain on sale of marketable securities | 0 us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities | 0 us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities | (745)us-gaap_NetRealizedOrUnrealizedGainLossOnTradingSecurities
Deferred income taxes | 3,870 us-gaap_DeferredIncomeTaxExpenseBenefit | 1,359 us-gaap_DeferredIncomeTaxExpenseBenefit | 549 us-gaap_DeferredIncomeTaxExpenseBenefit
Excess tax benefits from stock-based compensation | (576)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (259)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities | (877)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Stock-based compensation expense | 1,460 us-gaap_ShareBasedCompensation | 1,467 us-gaap_ShareBasedCompensation | 1,917 us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities, net of effects from acquisitions: |  |  |
Trade receivables | (13,599)us-gaap_IncreaseDecreaseInAccountsReceivable | (6,445)us-gaap_IncreaseDecreaseInAccountsReceivable | (6,576)us-gaap_IncreaseDecreaseInAccountsReceivable
Employee receivables | 46 us-gaap_IncreaseDecreaseInDueFromEmployeeCurrent | (53)us-gaap_IncreaseDecreaseInDueFromEmployeeCurrent | (11)us-gaap_IncreaseDecreaseInDueFromEmployeeCurrent
Other receivables | (3,042)us-gaap_IncreaseDecreaseInOtherReceivables | (609)us-gaap_IncreaseDecreaseInOtherReceivables | (760)us-gaap_IncreaseDecreaseInOtherReceivables
Inventories | (9,396)us-gaap_IncreaseDecreaseInInventories | 2,334 us-gaap_IncreaseDecreaseInInventories | (8,965)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses | (58)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | (758)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets | 736 us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Prepaid income taxes | (41)us-gaap_IncreaseDecreaseInPrepaidTaxes | 18 us-gaap_IncreaseDecreaseInPrepaidTaxes | (367)us-gaap_IncreaseDecreaseInPrepaidTaxes
Income tax refund receivables | 11 us-gaap_IncreaseDecreaseInIncomeTaxesReceivable | 1,267 us-gaap_IncreaseDecreaseInIncomeTaxesReceivable | 452 us-gaap_IncreaseDecreaseInIncomeTaxesReceivable
Other assets | (1,388)us-gaap_IncreaseDecreaseInOtherOperatingAssets | (1,806)us-gaap_IncreaseDecreaseInOtherOperatingAssets | (1,178)us-gaap_IncreaseDecreaseInOtherOperatingAssets
Trade payables | 5,326 us-gaap_IncreaseDecreaseInAccountsPayableTrade | (5)us-gaap_IncreaseDecreaseInAccountsPayableTrade | 7,721 us-gaap_IncreaseDecreaseInAccountsPayableTrade
Accrued expenses | 6,137 us-gaap_IncreaseDecreaseInAccruedLiabilities | (276)us-gaap_IncreaseDecreaseInAccruedLiabilities | 4,448 us-gaap_IncreaseDecreaseInAccruedLiabilities
Advances from employees | 142 us-gaap_IncreaseDecreaseInDueToEmployeesCurrent | (277)us-gaap_IncreaseDecreaseInDueToEmployeesCurrent | 317 us-gaap_IncreaseDecreaseInDueToEmployeesCurrent
Income taxes payable | 1,083 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | 255 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable | 2,057 us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Liabilities related to unrecognized tax benefits | (76)mmsi_IncreaseDecreaseLiabilityForUncertainTaxPositions | (520)mmsi_IncreaseDecreaseLiabilityForUncertainTaxPositions | (209)mmsi_IncreaseDecreaseLiabilityForUncertainTaxPositions
Deferred compensation payable | 802 us-gaap_IncreaseDecreaseInDeferredCompensation | 1,877 us-gaap_IncreaseDecreaseInDeferredCompensation | 1,371 us-gaap_IncreaseDecreaseInDeferredCompensation
Other long-term obligations | 566 us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | (4,399)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities | (89)us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Total adjustments | 30,351 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities | 34,803 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities | 27,228 us-gaap_AdjustmentsToReconcileNetIncomeLossToCashProvidedByUsedInOperatingActivities
Net cash provided by operating activities | 53,325 us-gaap_NetCashProvidedByUsedInOperatingActivities | 51,373 us-gaap_NetCashProvidedByUsedInOperatingActivities | 46,938 us-gaap_NetCashProvidedByUsedInOperatingActivities
Capital expenditures for: |  |  |
Property and equipment | (34,181)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (59,505)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment | (64,643)us-gaap_PaymentsToAcquirePropertyPlantAndEquipment
Intangible assets | (1,714)us-gaap_PaymentsToAcquireIntangibleAssets | (1,617)us-gaap_PaymentsToAcquireIntangibleAssets | (1,460)us-gaap_PaymentsToAcquireIntangibleAssets
Proceeds from sale-leaseback transactions | 5,521 us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities | 24,000 us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities | 0 us-gaap_SaleLeasebackTransactionGrossProceedsInvestingActivities
Proceeds from the sale of marketable securities | 0 us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities | 0 us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities | 3,248 us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Proceeds from the sale of property and equipment | 98 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 113 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment | 43 us-gaap_ProceedsFromSaleOfPropertyPlantAndEquipment
Cash paid in acquisitions, net of cash acquired | (5,927)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | (31,600)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired | (192,762)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Net cash used in investing activities | (36,203)us-gaap_NetCashProvidedByUsedInInvestingActivities | (68,609)us-gaap_NetCashProvidedByUsedInInvestingActivities | (255,574)us-gaap_NetCashProvidedByUsedInInvestingActivities
CASH FLOWS FROM FINANCING ACTIVITIES: |  |  |
Proceeds from issuance of common stock | 8,146 us-gaap_ProceedsFromIssuanceOfCommonStock | 3,729 us-gaap_ProceedsFromIssuanceOfCommonStock | 3,755 us-gaap_ProceedsFromIssuanceOfCommonStock
Proceeds from issuance of long-term debt | 144,018 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 176,764 us-gaap_ProceedsFromIssuanceOfLongTermDebt | 330,630 us-gaap_ProceedsFromIssuanceOfLongTermDebt
Payments on long-term debt | (169,392)us-gaap_RepaymentsOfLongTermDebt | (165,477)us-gaap_RepaymentsOfLongTermDebt | (123,801)us-gaap_RepaymentsOfLongTermDebt
Proceeds from industrial assistant grants | 0 mmsi_ProceedsFromIndustrialAssistantGrants | 389 mmsi_ProceedsFromIndustrialAssistantGrants | 1,029 mmsi_ProceedsFromIndustrialAssistantGrants
Excess tax benefits from stock-based compensation | 576 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 259 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities | 877 us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Long-term debt issuance costs | 0 us-gaap_PaymentsOfDebtIssuanceCosts | (798)us-gaap_PaymentsOfDebtIssuanceCosts | (3,706)us-gaap_PaymentsOfDebtIssuanceCosts
Contingent payments related to acquisitions | (67)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | (77)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities | (57)us-gaap_ProceedsFromPaymentsForOtherFinancingActivities
Payment of taxes related to an exchange of common stock | (249)mmsi_PaymentOfTaxesExchangeOfCommonStock | (21)mmsi_PaymentOfTaxesExchangeOfCommonStock | (439)mmsi_PaymentOfTaxesExchangeOfCommonStock
Net cash provided by (used in) financing activities | (16,968)us-gaap_NetCashProvidedByUsedInFinancingActivities | 14,768 us-gaap_NetCashProvidedByUsedInFinancingActivities | 208,288 us-gaap_NetCashProvidedByUsedInFinancingActivities
EFFECT OF EXCHANGE RATES ON CASH | (258)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | 208 us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents | (61)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
NET (DECREASE) IN CASH AND CASH EQUIVALENTS | (104)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (2,260)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease | (409)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS: |  |  |
Beginning of year | 7,459 us-gaap_CashAndCashEquivalentsAtCarryingValue | 9,719 us-gaap_CashAndCashEquivalentsAtCarryingValue | 10,128 us-gaap_CashAndCashEquivalentsAtCarryingValue
End of year | 7,355 us-gaap_CashAndCashEquivalentsAtCarryingValue | 7,459 us-gaap_CashAndCashEquivalentsAtCarryingValue | 9,719 us-gaap_CashAndCashEquivalentsAtCarryingValue
SUPPLEMENTAL DISCLOSURES OF CASH FLOW INFORMATION |  |  |
Interest (net of capitalized interest of $389, $1,038 and $456, respectively) | 9,014 us-gaap_InterestPaidNet | 7,877 us-gaap_InterestPaidNet | 434 us-gaap_InterestPaidNet
Income taxes | 3,289 us-gaap_IncomeTaxesPaidNet | 735 us-gaap_IncomeTaxesPaidNet | 5,277 us-gaap_IncomeTaxesPaidNet
SUPPLEMENTAL DISCLOSURES OF NON-CASH INVESTING AND FINANCING ACTIVITIES |  |  |
Property and equipment purchases in accounts payable | 2,896 us-gaap_CapitalExpendituresIncurredButNotYetPaid | 4,055 us-gaap_CapitalExpendituresIncurredButNotYetPaid | 12,372 us-gaap_CapitalExpendituresIncurredButNotYetPaid
Receivable due for sale of equipment | 1,256 mmsi_ReceivablefromSaleofPropertyPlantandEquipment | 0 mmsi_ReceivablefromSaleofPropertyPlantandEquipment | 0 mmsi_ReceivablefromSaleofPropertyPlantandEquipment
Acquisition of customer list in exchange for a settlement of trade receivables | 0 mmsi_AcquisitionOfCustomerListInExchangeForSettlementOfTradeReceivables | 0 mmsi_AcquisitionOfCustomerListInExchangeForSettlementOfTradeReceivables | 377 mmsi_AcquisitionOfCustomerListInExchangeForSettlementOfTradeReceivables
Acquisition purchases in accrued expenses and other long-term obligations | 1,000 mmsi_AcquisitionOfDevelopedTechnologyInAccruedExpenses | 350 mmsi_AcquisitionOfDevelopedTechnologyInAccruedExpenses | 5,149 mmsi_AcquisitionOfDevelopedTechnologyInAccruedExpenses
Merit common stock surrendered (127, 45 and 131 shares, respectively) in exchange for exercise of stock options | $ 1,941 mmsi_StockSurrenderedDuringPeriodValueStockOptionsExercised | $ 452 mmsi_StockSurrenderedDuringPeriodValueStockOptionsExercised | $ 1,831 mmsi_StockSurrenderedDuringPeriodValueStockOptionsExercised

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- Definition The amount of impairment loss recognized in the period resulting from the write-down of the carrying amount of a finite-lived intangible asset to fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16373-109275 + Details
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- Definition The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid. + 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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- Definition The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3291-108585 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Financing Activities -URI http://asc.fasb.org/extlink&oid=6513228 + Details
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- Definition The amount of the write-off for research and development assets that were acquired in a transaction other than a business combination. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=26713463&loc=d3e16265-109275 + Details
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- Definition Amount of cash inflow before closing and deferred financing costs received by a seller-lessee in a sale-leaseback recognized in investing activities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 51 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51840-112757 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51831-112757 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 40 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=28365400&loc=d3e51843-112757 + 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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