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Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Income Tax Disclosure [Abstract] |
Summary of Components of Income Tax Provision | The components of the income tax provision (benefit) are as follows (in thousands):
|  | December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Federal: |  |  |  |  |  |  |  |  |  |  |  |
Current |  | $ | 130,053 |  |  | $ | 166,758 |  |  | $ | 168,596 |
Deferred |  |  | (63,038 | ) |  |  | 15,596 |  |  |  | 12,866 |
|  |  | 67,015 |  |  |  | 182,354 |  |  |  | 181,462 |
State: |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 20,070 |  |  |  | 4,296 |  |  |  | 20,948 |
Deferred |  |  | 2,965 |  |  |  | 2,553 |  |  |  | 1,628 |
|  |  | 23,035 |  |  |  | 6,849 |  |  |  | 22,576 |
Total |  | $ | 90,050 |  |  | $ | 189,203 |  |  | $ | 204,038 |
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, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Tax at statutory rate |  |  | 35.00 | % |  |  | 35.00 | % |  |  | 35.00 | %
State income tax, net of federal benefit |  |  | 3.33 |  |  |  | 2.94 |  |  |  | 2.97 |
Non-deductible expenses |  |  | 0.49 |  |  |  | 0.43 |  |  |  | 0.34 |
Change in accrual estimates relating to uncertain tax positions |  |  | 0.02 |  |  |  | (2.11 | ) |  |  | (0.43 | )
Change in valuation allowance |  |  | — |  |  |  | 0.48 |  |  |  | 0.29 |
Other, net |  |  | 0.16 |  |  |  | 0.06 |  |  |  | (0.41 | )
Change in tax law |  |  | (17.06 | ) |  |  | — |  |  |  | — |
Income tax provision |  |  | 21.94 | % |  |  | 36.80 | % |  |  | 37.76 | %
Significant Components of Deferred Income Tax Assets and Liabilities | All of the Company’s deferred tax assets and liabilities are classified as long-term. The significant components of deferred income tax assets and liabilities are as follows (in thousands):
|  | December 31, |
|  | 2017 |  |  | 2016 |
Allowance for uncollectible accounts |  | $ | 80,056 |  |  | $ | 103,525 |
Reserves and accruals |  |  | 45,454 |  |  |  | 62,212 |
Stock-based compensation |  |  | 7,975 |  |  |  | 13,726 |
Net operating loss carryforward |  |  | 28,569 |  |  |  | 49,156 |
Property and equipment |  |  | 685 |  |  |  | 1,621 |
Other |  |  | 970 |  |  |  | 1,610 |
Deferred tax assets before valuation allowance |  |  | 163,709 |  |  |  | 231,850 |
Less: Valuation allowance |  |  | (2,615 | ) |  |  | (4,014 | )
Deferred tax assets, net of valuation allowance |  |  | 161,094 |  |  |  | 227,836 |
Gross deferred tax liabilities: |  |  |  |  |  |  |  |
Amortization |  |  | (258,618 | ) |  |  | (380,594 | )
Accrual to cash adjustment |  |  | (31,290 | ) |  |  | (53,771 | )
Other |  |  | (4,150 | ) |  |  | (1,023 | )
Total deferred tax liabilities |  |  | (294,058 | ) |  |  | (435,388 | )
Net deferred tax liability |  | $ | (132,964 | ) |  | $ | (207,552 | )
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, 2017, 2016 and 2015 (in thousands):
|  | Years Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
Balance at beginning of year |  | $ | 9,469 |  |  | $ | 18,447 |  |  | $ | 17,165 |
Increases related to prior year tax positions |  |  | 2,284 |  |  |  | 301 |  |  |  | 467 |
Decreases related to prior year tax positions |  |  | (143 | ) |  |  | (3,927 | ) |  |  | (1,168 | )
Increases related to current year tax positions |  |  | 1,430 |  |  |  | 2,258 |  |  |  | 3,675 |
Settlements |  |  | — |  |  |  | (5,644 | ) |  |  | — |
Decreases related to lapse of statutes of limitation |  |  | (2,068 | ) |  |  | (1,966 | ) |  |  | (1,692 | )
Balance at end of year |  | $ | 10,972 |  |  | $ | 9,469 |  |  | $ | 18,447 |

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- Definition Tabular disclosure of the components of income tax expense attributable to continuing operations for each year presented including, but not limited to: current tax expense (benefit), deferred tax expense (benefit), investment tax credits, government grants, the benefits of operating loss carryforwards, tax expense that results from allocating certain tax benefits either directly to contributed capital or to reduce goodwill or other noncurrent intangible assets of an acquired entity, adjustments of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity, and adjustments of the beginning-of-the-year balances of a valuation allowance because of a change in circumstances that causes a change in judgment about the realizability of the related deferred tax asset in future years. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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- 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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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- Definition Tabular disclosure for 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 and other income tax contingencies. Includes, but is not limited to, interest and penalties, reconciliation of unrecognized tax benefits, unrecognized tax benefits that would affect the effective tax rate, tax years that remain subject to examination by tax jurisdictions, and information about positions for which it is reasonably possible that amounts unrecognized will significantly change within 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15A -URI http://asc.fasb.org/extlink&oid=84230637&loc=SL6600010-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 19 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32840-109319 + Details
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