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Income Taxes: (Tables) | 12 Months Ended
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Dec. 31, 2012
Summary of Components of Income Tax Provision | The components of the income tax provision are as follows (in thousands):
|  | December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Federal: |  |  |  |  |  |  |  |  |  |  |  |
Current |  | $ | 111,940 |  |  | $ | 113,290 |  |  | $ | 73,756 |
Deferred |  |  | 19,814 |  |  |  | 7,486 |  |  |  | 22,814 |
|  |  | 131,754 |  |  |  | 120,776 |  |  |  | 96,570 |
State: |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 13,980 |  |  |  | 13,895 |  |  |  | 10,330 |
Deferred |  |  | 1,530 |  |  |  | 577 |  |  |  | 1,561 |
|  |  | 15,510 |  |  |  | 14,472 |  |  |  | 11,891 |
Total |  | $ | 147,264 |  |  | $ | 135,248 |  |  | $ | 108,461 |
Schedule of Differences Between Effective Rate and United States Federal Income Tax Statutory Rate | The differences between the effective rate and the United States federal income tax statutory rate are as follows:
|  | December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Tax at statutory rate |  |  | 35.00 | % |  |  | 35.00 | % |  |  | 35.00 | %
State income tax, net of federal benefit |  |  | 2.60 |  |  |  | 2.66 |  |  |  | 2.42 |
Non-deductible expenses |  |  | 0.36 |  |  |  | 0.32 |  |  |  | 0.35 |
Change in accrual estimates relating to uncertain tax positions |  |  | (0.15 | ) |  |  | 0.44 |  |  |  | (2.81 | )
Other, net |  |  | 0.13 |  |  |  | (0.13 | ) |  |  | (0.10 | )
Income tax provision |  |  | 37.94 | % |  |  | 38.29 | % |  |  | 34.86 | %
Significant Components of Deferred Income Tax Assets And Liabilities | The significant components of deferred income tax assets and liabilities are as follows (in thousands):
|  | December 31, 2012 |  |  | December 31, 2011 |
|  | Total |  |  | Current |  |  | Non- Current |  |  | Total |  |  | Current |  |  | Non- Current |
Allowance for uncollectible accounts |  | $ | 44,232 |  |  | $ | 44,232 |  |  | $ | — |  |  | $ | 47,459 |  |  | $ | 47,459 |  |  | $ | — |
Reserves and accruals |  |  | 43,345 |  |  |  | 39,942 |  |  |  | 3,403 |  |  |  | 40,807 |  |  |  | 36,828 |  |  |  | 3,979 |
Stock-based compensation |  |  | 18,444 |  |  |  | 11,856 |  |  |  | 6,588 |  |  |  | 18,657 |  |  |  | 10,586 |  |  |  | 8,071 |
Net operating loss carryforward |  |  | 5,624 |  |  |  | 5,624 |  |  |  | — |  |  |  | 3,533 |  |  |  | 3,533 |  |  |  | — |
Property and equipment |  |  | 802 |  |  |  | — |  |  |  | 802 |  |  |  | — |  |  |  | — |  |  |  | — |
Other |  |  | 509 |  |  |  | 509 |  |  |  | — |  |  |  | 483 |  |  |  | 483 |  |  |  | — |
Total deferred tax assets |  |  | 112,956 |  |  |  | 102,163 |  |  |  | 10,793 |  |  |  | 110,939 |  |  |  | 98,889 |  |  |  | 12,050 |
Amortization |  |  | (136,670 | ) |  |  | — |  |  |  | (136,670 | ) |  |  | (105,753 | ) |  |  | — |  |  |  | (105,753 | )
Accrual to cash adjustment |  |  | (33,129 | ) |  |  | (33,129 | ) |  |  | — |  |  |  | (28,575 | ) |  |  | (28,575 | ) |  |  | — |
Property and equipment |  |  | — |  |  |  | — |  |  |  | — |  |  |  | (128 | ) |  |  | — |  |  |  | (128 | )
Total deferred tax liabilities |  |  | (169,799 | ) |  |  | (33,129 | ) |  |  | (136,670 | ) |  |  | (134,456 | ) |  |  | (28,575 | ) |  |  | (105,881 | )
Net deferred tax (liability) asset |  | $ | (56,843 | ) |  | $ | 69,034 |  |  | $ | (125,877 | ) |  | $ | (23,517 | ) |  | $ | 70,314 |  |  | $ | (93,831 | )
Schedule of Activity Related to Gross Unrecognized Tax Benefits | The following table summarizes the activity related to the Company’s liability for uncertain tax positions for the years ended December 31, 2012, 2011 and 2010 (in thousands):
|  | Years Ended December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Balance at beginning of year |  | $ | 16,165 |  |  | $ | 22,290 |  |  | $ | 49,416 |
Increases related to prior year tax positions |  |  | 102 |  |  |  | 44 |  |  |  | 948 |
Decreases related to prior year tax positions |  |  | — |  |  |  | — |  |  |  | (9,569 | )
Increases related to current year tax positions |  |  | 2,478 |  |  |  | 2,541 |  |  |  | 2,334 |
Decreases related to current year tax positions |  |  | (3,671 | ) |  |  | (7,203 | ) |  |  | (19,035 | )
Settlements |  |  | — |  |  |  | 13 |  |  |  | (500 | )
Decreases related to lapse of statutes of limitations |  |  | (2,002 | ) |  |  | (1,520 | ) |  |  | (1,304 | )
Balance at end of year |  | $ | 13,072 |  |  | $ | 16,165 |  |  | $ | 22,290 |

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- 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 Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319 Reference 2: 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. + Details
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