XML 78 R34.htm IDEA: XBRL DOCUMENT
v2.4.0.6

Income Taxes (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2011
Income Taxes [Abstract] |
Components Of The Income Tax Provision |
|  | December 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Federal: |  |  |  |  |  |  |  |  |  |  |  |
Current |  | $ | 113,290 |  |  | $ | 73,756 |  |  | $ | 93,590 |
Deferred |  |  | 7,486 |  |  |  | 22,814 |  |  |  | 6,391 |
|  |  | 120,776 |  |  |  | 96,570 |  |  |  | 99,981 |
State: |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 13,895 |  |  |  | 10,330 |  |  |  | 11,315 |
Deferred |  |  | 577 |  |  |  | 1,561 |  |  |  | 600 |
|  |  | 14,472 |  |  |  | 11,891 |  |  |  | 11,915 |
Total |  | $ | 135,248 |  |  | $ | 108,461 |  |  | $ | 111,896 |
Schedule Of Differences Between The Effective Rate And The United States Federal Income Tax Statutory Rate |
|  | December 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Tax at statutory rate |  |  | 35.00 | % |  |  | 35.00 | % |  |  | 35.00 | %
State income tax, net of federal benefit |  |  | 2.66 |  |  |  | 2.42 |  |  |  | 2.69 |
Non-deductible expenses |  |  | 0.32 |  |  |  | 0.35 |  |  |  | 0.40 |
Change in accrual estimates relating to uncertain tax positions |  |  | 0.44 |  |  |  | (2.81 | ) |  |  | 0.82 |
Other, net |  |  | (0.13 | ) |  |  | (0.10 | ) |  |  | (0.02 | )
Income tax provision |  |  | 38.29 | % |  |  | 34.86 | % |  |  | 38.89 | %
Significant Components Of Deferred Income Tax Assets And Liabilities |
|  | December 31, 2011 |  |  | December 31, 2010 |
|  | Total |  |  | Current |  |  | Non- Current |  |  | Total |  |  | Current |  |  | Non- Current |
Allowance for uncollectible accounts |  | $ | 47,459 |  |  | $ | 47,459 |  |  | $ | — |  |  | $ | 34,254 |  |  | $ | 34,254 |  |  | $ | — |
Net operating loss carryforward |  |  | 3,533 |  |  |  | 3,533 |  |  |  | — |  |  |  | 7,799 |  |  |  | 7,799 |  |  |  | — |
Reserves and accruals |  |  | 40,807 |  |  |  | 36,828 |  |  |  | 3,979 |  |  |  | 37,045 |  |  |  | 33,378 |  |  |  | 3,667 |
Other |  |  | 483 |  |  |  | 483 |  |  |  | — |  |  |  | 488 |  |  |  | 488 |  |  |  | — |
Stock-based compensation |  |  | 18,657 |  |  |  | 10,586 |  |  |  | 8,071 |  |  |  | 18,316 |  |  |  | 8,700 |  |  |  | 9,616 |
Total deferred tax assets |  |  | 110,939 |  |  |  | 98,889 |  |  |  | 12,050 |  |  |  | 97,902 |  |  |  | 84,619 |  |  |  | 13,283 |
Accrual to cash adjustment |  |  | (28,575 | ) |  |  | (28,575 | ) |  |  | — |  |  |  | (24,040 | ) |  |  | (24,040 | ) |  |  | — |
Property and equipment |  |  | (128 | ) |  |  | — |  |  |  | (128 | ) |  |  | (965 | ) |  |  | — |  |  |  | (965 | )
Amortization |  |  | (105,753 | ) |  |  | — |  |  |  | (105,753 | ) |  |  | (86,384 | ) |  |  | — |  |  |  | (86,384 | )
Total deferred tax liabilities |  |  | (134,456 | ) |  |  | (28,575 | ) |  |  | (105,881 | ) |  |  | (111,389 | ) |  |  | (24,040 | ) |  |  | (87,349 | )
Net deferred tax (liability) asset |  | $ | (23,517 | ) |  | $ | 70,314 |  |  | $ | (93,831 | ) |  | $ | (13,487 | ) |  | $ | 60,579 |  |  | $ | (74,066 | )
Schedule Of Activity Related To Gross Unrecognized Tax Benefits |
|  | Years Ended December 31, |
|  | 2011 |  |  | 2010 |  |  | 2009 |
Balance at beginning of year |  | $ | 22,290 |  |  | $ | 49,416 |  |  | $ | 47,562 |
Increases related to prior year tax positions |  |  | 44 |  |  |  | 948 |  |  |  | — |
Decreases related to prior year tax positions |  |  | — |  |  |  | (9,569 | ) |  |  | (1,051 | )
Increases related to current year tax positions |  |  | 2,541 |  |  |  | 2,334 |  |  |  | 5,867 |
Decreases related to current year tax positions |  |  | (7,203 | ) |  |  | (19,035 | ) |  |  | — |
Settlements |  |  | 13 |  |  |  | (500 | ) |  |  | (2,191 | )
Decreases related to lapse of statutes of limitations |  |  | (1,520 | ) |  |  | (1,304 | ) |  |  | (771 | )
Balance at end of year |  | $ | 16,165 |  |  | $ | 22,290 |  |  | $ | 49,416 |

X
- Definition Schedule of differences between the federal statutory tax rate and effective tax rate. + References No definition available. + Details
Name: | md_ScheduleOfDifferencesBetweenFederalStatutoryTaxRateAndEffectiveTaxRate
Namespace Prefix: | md_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_IncomeTaxDisclosureAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of the components of net deferred tax asset or liability recognized in an entity's statement of financial position, including the following: the total of all deferred tax liabilities, the total of all deferred tax assets, the total valuation allowance recognized for deferred tax assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 740 -SubTopic 10 -Publisher FASB -Number -Article -Subparagraph -Name Accounting Standards Codification -Paragraph 2 -Section 50 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 + Details
Name: | us-gaap_ScheduleOfDeferredTaxAssetsAndLiabilitiesTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of income before income tax between domestic and foreign jurisdictions. + References No definition available. + Details
Name: | us-gaap_ScheduleOfIncomeBeforeIncomeTaxDomesticAndForeignTableTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration

X
- Definition Tabular disclosure of tax positions taken in the tax returns filed or to be filed for which it is more likely than not that the tax position will not be sustained upon examination by taxing authorities (i.e., uncertain tax positions) and other types of income tax contingencies, including: (1) the policy on classification of interest and penalties; (2) a tabular reconciliation of the total amounts of unrecognized tax benefits at the beginning and end of the period; the total amount(s) of: (3) unrecognized tax benefits that, if recognized, would affect the effective tax rate, and (4) interest and penalties recognized in each of the income statement and balance sheet; (5) for positions for which it is reasonably possible that the total amounts unrecognized will significantly change within 12 months of the reporting date the: (i) nature of the uncertainty, (ii) nature of the event that could occur that would cause the change, and (iii) an estimate of the range of the reasonably possible change or a statement that an estimate of the range cannot be made; and (6) a description of tax years that remain subject to examination by major tax jurisdictions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Interpretation (FIN) -Number 48 -Paragraph 21 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 + Details
Name: | us-gaap_SummaryOfIncomeTaxContingenciesTextBlock
Namespace Prefix: | us-gaap_
Data Type: | nonnum:textBlockItemType
Balance Type: | na
Period Type: | duration