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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 $ 317,203us-gaap_ProfitLoss $ 280,517us-gaap_ProfitLoss $ 240,907us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided from operating activities:      
Depreciation and amortization 45,990us-gaap_DepreciationDepletionAndAmortization 39,966us-gaap_DepreciationDepletionAndAmortization 30,816us-gaap_DepreciationDepletionAndAmortization
Net change in fair value of contingent consideration liabilities (417)us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 3,656us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1 995us-gaap_BusinessCombinationContingentConsiderationArrangementsChangeInAmountOfContingentConsiderationLiability1
Stock-based compensation expense 31,719us-gaap_ShareBasedCompensation 31,288us-gaap_ShareBasedCompensation 28,437us-gaap_ShareBasedCompensation
Equity in earnings of unconsolidated affiliate (1,780)us-gaap_IncomeLossFromEquityMethodInvestments    
Deferred income taxes 2,559us-gaap_DeferredIncomeTaxExpenseBenefit 15,920us-gaap_DeferredIncomeTaxExpenseBenefit 21,344us-gaap_DeferredIncomeTaxExpenseBenefit
Changes in assets and liabilities:      
Accounts receivable (57,018)us-gaap_IncreaseDecreaseInAccountsReceivable (37,331)us-gaap_IncreaseDecreaseInAccountsReceivable (17,678)us-gaap_IncreaseDecreaseInAccountsReceivable
Prepaid expenses and other assets 1,506us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets 212us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets (244)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Other assets 2,137us-gaap_IncreaseDecreaseInOtherOperatingAssets (3,541)us-gaap_IncreaseDecreaseInOtherOperatingAssets 1,153us-gaap_IncreaseDecreaseInOtherOperatingAssets
Accounts payable and accrued expenses 66,039us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 49,239us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities 16,953us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
Income taxes payable 6,998us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable 5,772us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable (7,343)us-gaap_IncreaseDecreaseInAccruedIncomeTaxesPayable
Payments of contingent consideration liabilities (4,071)md_PaymentOfContingentConsiderationLiabilityOperating (1,308)md_PaymentOfContingentConsiderationLiabilityOperating (786)md_PaymentOfContingentConsiderationLiabilityOperating
Long-term professional liabilities 9,284us-gaap_MalpracticeLossContingencyPeriodIncreaseDecrease 19,797us-gaap_MalpracticeLossContingencyPeriodIncreaseDecrease 9,941us-gaap_MalpracticeLossContingencyPeriodIncreaseDecrease
Other liabilities 2,492us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 1,211us-gaap_IncreaseDecreaseInOtherOperatingLiabilities 411us-gaap_IncreaseDecreaseInOtherOperatingLiabilities
Net cash provided from operating activities 422,641us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 405,398us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations 324,906us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
Cash flows from investing activities:      
Acquisition payments, net of cash acquired (479,394)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (238,045)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired (441,006)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
Purchases of investments (26,884)us-gaap_PaymentsToAcquireInvestments (20,802)us-gaap_PaymentsToAcquireInvestments (33,120)us-gaap_PaymentsToAcquireInvestments
Proceeds from sales or maturities of investments 20,735us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments 11,011us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments 28,073us-gaap_ProceedsFromSaleMaturityAndCollectionsOfInvestments
Purchases of property and equipment (18,061)us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment (15,654)us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment (14,495)us-gaap_PaymentsToAcquireOtherPropertyPlantAndEquipment
Net cash used in investing activities (503,604)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (263,490)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations (460,548)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
Cash flows from financing activities:      
Borrowings on credit facility 1,754,500us-gaap_ProceedsFromLinesOfCredit 911,500us-gaap_ProceedsFromLinesOfCredit 517,500us-gaap_ProceedsFromLinesOfCredit
Payments on credit facility (1,213,500)us-gaap_RepaymentsOfLinesOfCredit (1,028,500)us-gaap_RepaymentsOfLinesOfCredit (402,500)us-gaap_RepaymentsOfLinesOfCredit
Payments for credit facility financing costs (4,281)us-gaap_PaymentsOfFinancingCosts   (2,397)us-gaap_PaymentsOfFinancingCosts
Payments of contingent consideration liabilities (11,740)md_PaymentOfContingentConsiderationLiabilityFinancing (10,365)md_PaymentOfContingentConsiderationLiabilityFinancing (9,445)md_PaymentOfContingentConsiderationLiabilityFinancing
Payments on capital lease obligations (159)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (99)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations (136)us-gaap_RepaymentsOfLongTermCapitalLeaseObligations
Excess tax benefit from exercises of stock options and vesting of restricted and deferred stock 17,462us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 18,579us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities 6,494us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
Proceeds from issuance of common stock 42,876us-gaap_ProceedsFromIssuanceOfCommonStock 28,697us-gaap_ProceedsFromIssuanceOfCommonStock 28,810us-gaap_ProceedsFromIssuanceOfCommonStock
Contribution from noncontrolling interests 1,025us-gaap_ProceedsFromMinorityShareholders    
Repurchases of common stock (488,429)us-gaap_PaymentsForRepurchaseOfCommonStock (51,863)us-gaap_PaymentsForRepurchaseOfCommonStock  
Net cash provided from (used in) financing activities 97,754us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations (132,051)us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations 138,326us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
Net increase in cash and cash equivalents 16,791us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 9,857us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease 2,684us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
Cash and cash equivalents at beginning of year 31,137us-gaap_CashAndCashEquivalentsAtCarryingValue 21,280us-gaap_CashAndCashEquivalentsAtCarryingValue 18,596us-gaap_CashAndCashEquivalentsAtCarryingValue
Cash and cash equivalents at end of year 47,928us-gaap_CashAndCashEquivalentsAtCarryingValue 31,137us-gaap_CashAndCashEquivalentsAtCarryingValue 21,280us-gaap_CashAndCashEquivalentsAtCarryingValue
Supplemental disclosure of cash flow information:      
Interest 7,323us-gaap_InterestPaidNet 3,312us-gaap_InterestPaidNet 2,044us-gaap_InterestPaidNet
Income taxes 161,841us-gaap_IncomeTaxesPaidNet 126,411us-gaap_IncomeTaxesPaidNet 129,636us-gaap_IncomeTaxesPaidNet
Non-cash financing activities:      
Equipment financed through capital leases $ 1,244us-gaap_CapitalLeaseObligationsIncurred