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Income Taxes | 12 Months Ended
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Dec. 31, 2014
Income Tax Disclosure [Abstract] |
Income Taxes | 11. Income Taxes: The components of the income tax provision are as follows (in thousands):
|  | December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Federal: |  |  |  |  |  |  |  |  |  |  |  |
Current |  | $ | 167,745 |  |  | $ | 134,938 |  |  | $ | 111,940 |
Deferred |  |  | 2,262 |  |  |  | 14,784 |  |  |  | 19,814 |
|  |  | 170,007 |  |  |  | 149,722 |  |  |  | 131,754 |
State: |  |  |  |  |  |  |  |  |  |  |  |
Current |  |  | 21,109 |  |  |  | 17,037 |  |  |  | 13,980 |
Deferred |  |  | 297 |  |  |  | 1,136 |  |  |  | 1,530 |
|  |  | 21,406 |  |  |  | 18,173 |  |  |  | 15,510 |
Total |  | $ | 191,413 |  |  | $ | 167,895 |  |  | $ | 147,264 |
The Company files its tax return on a consolidated basis with its subsidiaries. The remaining affiliated professional contractors file tax returns on an individual basis. The effective tax rate was 37.63%, 37.44% and 37.94% for the years ended December 31, 2014, 2013 and 2012, respectively. The differences between the effective rate and the United States federal income tax statutory rate are as follows:
|  | December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Tax at statutory rate |  |  | 35.00 | % |  |  | 35.00 | % |  |  | 35.00 | %
State income tax, net of federal benefit |  |  | 2.74 |  |  |  | 2.63 |  |  |  | 2.60 |
Non-deductible expenses |  |  | 0.33 |  |  |  | 0.27 |  |  |  | 0.36 |
Change in accrual estimates relating to uncertain tax positions |  |  | (0.59 | ) |  |  | (0.48 | ) |  |  | (0.15 | )
Other, net |  |  | 0.15 |  |  |  | 0.02 |  |  |  | 0.13 |
Income tax provision |  |  | 37.63 | % |  |  | 37.44 | % |  |  | 37.94 | %
The significant components of deferred income tax assets and liabilities are as follows (in thousands):
|  | December 31, 2014 |  |  | December 31, 2013 |
|  | Total |  |  | Current |  |  | Non- Current |  |  | Total |  |  | Current |  |  | Non- Current |
Allowance for uncollectible accounts |  | $ | 48,178 |  |  | $ | 48,178 |  |  | $ | — |  |  | $ | 42,425 |  |  | $ | 42,425 |  |  | $ | — |
Reserves and accruals |  |  | 62,708 |  |  |  | 26,066 |  |  |  | 36,642 |  |  |  | 52,519 |  |  |  | 18,341 |  |  |  | 34,178 |
Stock-based compensation |  |  | 14,354 |  |  |  | 8,346 |  |  |  | 6,008 |  |  |  | 16,457 |  |  |  | 3,628 |  |  |  | 12,829 |
Net operating loss carryforward |  |  | 10,933 |  |  |  | 1,504 |  |  |  | 9,429 |  |  |  | 6,385 |  |  |  | 3,744 |  |  |  | 2,641 |
Property and equipment |  |  | 1,524 |  |  |  | — |  |  |  | 1,524 |  |  |  | 1,310 |  |  |  | — |  |  |  | 1,310 |
Other |  |  | 1,461 |  |  |  | 583 |  |  |  | 878 |  |  |  | 446 |  |  |  | 446 |  |  |  | — |
Total deferred tax assets |  |  | 139,158 |  |  |  | 84,677 |  |  |  | 54,481 |  |  |  | 119,542 |  |  |  | 68,584 |  |  |  | 50,958 |
Amortization |  |  | (214,968 | ) |  |  | — |  |  |  | (214,968 | ) |  |  | (162,399 | ) |  |  | — |  |  |  | (162,399 | )
Accrual to cash adjustment |  |  | (38,524 | ) |  |  | (38,524 | ) |  |  | — |  |  |  | (37,818 | ) |  |  | (37,818 | ) |  |  | — |
Other |  |  | (192 | ) |  |  | (192 | ) |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Total deferred tax liabilities |  |  | (253,684 | ) |  |  | (38,716 | ) |  |  | (214,968 | ) |  |  | (200,217 | ) |  |  | (37,818 | ) |  |  | (162,399 | )
Net deferred tax (liability) asset |  | $ | (114,526 | ) |  | $ | 45,961 |  |  | $ | (160,487 | ) |  | $ | (80,675 | ) |  | $ | 30,766 |  |  | $ | (111,441 | )
The income tax benefit related to the exercise of stock options, the vesting of restricted and deferred stock and the purchase of shares under the Company’s non-qualified employee stock purchase plan in excess of amounts recorded as equity compensation expense reduces taxes currently payable and is credited to additional paid-in capital. Such amounts totaled approximately $17.5 million, $19.0 million, and $6.2 million for the years ended December 31, 2014, 2013 and 2012, respectively. The Company has net operating loss carryforwards for federal and state tax purposes totaling approximately $29.0 million, $16.9 million, and $14.9 million at December 31, 2014, 2013 and 2012, respectively, expiring at various times in 2019 through 2034. The changes in net operating loss carryforwards in 2014 and 2013 are primarily due to timing differences related to the recognition of income for tax purposes associated with physician practice acquisitions. As of December 31, 2014, 2013 and 2012, the Company’s liability for uncertain tax positions, excluding accrued interest and penalties, was $17.2 million, $14.9 million and $13.1 million, respectively. The Company had approximately $16.1 million of uncertain tax positions that, if recognized, would favorably impact its effective tax rate at December 31, 2014. The following table summarizes the activity related to the Company’s liability for uncertain tax positions for the years ended December 31, 2014, 2013 and 2012 (in thousands):
|  | Years Ended December 31, |
|  | 2014 |  |  | 2013 |  |  | 2012 |
Balance at beginning of year |  | $ | 14,902 |  |  | $ | 13,072 |  |  | $ | 16,165 |
Increases related to prior year tax positions |  |  | 40 |  |  |  | 338 |  |  |  | 102 |
Decreases related to prior year tax positions |  |  | — |  |  |  | (38 | ) |  |  | — |
Increases related to current year tax positions |  |  | 3,750 |  |  |  | 2,955 |  |  |  | 2,478 |
Decreases related to current year tax positions |  |  | — |  |  |  | — |  |  |  | (3,671 | )
Decreases related to lapse of statutes of limitations |  |  | (1,527 | ) |  |  | (1,425 | ) |  |  | (2,002 | )
Balance at end of year |  | $ | 17,165 |  |  | $ | 14,902 |  |  | $ | 13,072 |
During the years ended December 31, 2014 and 2013, the Company increased its liability for uncertain tax positions by a total of $2.3 million and $1.8 million, respectively, primarily related to additional taxes on current year positions, partially offset by decreases due to the expiration of statutes of limitation. The Company includes interest and penalties related to income tax liabilities in income tax expense. The Company recognized a net increase of $0.3 million related to interest and penalties during the year ended December 31, 2014. The Company recognized a net decrease of $0.6 million and a net increase of $0.3 million, respectively, of interest and penalties related to income tax liabilities during the years ended December 31, 2013 and 2012. At December 31, 2014 and 2013, the Company’s accrued liability for interest and penalties related to income tax liabilities totaled $8.7 million and $8.4 million, respectively. At December 31, 2014 and 2013, the Company’s total liability for uncertain tax positions of $25.9 million and $23.3 million, respectively, is included in other liabilities as presented in the Company’s Consolidated Balance Sheet. The Company anticipates that its liability for uncertain tax positions will be increased by approximately $4.9 million for additional taxes and decreased by approximately $1.7 million related to the expiration of certain statutes of limitation over the next 12 months. The Company is currently subject to U.S. Federal and various state income tax examinations for the tax years 2004 through 2013.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + 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 Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Article 4 Reference 4: 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=6907707&loc=d3e32639-109319 Reference 5: 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=6907707&loc=d3e32537-109319 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 + Details
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