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Selected Quarterly Financial Information (Tables) | 12 Months Ended
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Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract] |
Summary of Company's Selected Quarterly Financial Information | The following tables set forth a summary of the Company’s selected quarterly financial information for each of the four quarters ended December 31, 2013 and 2012 (in thousands, except for per share data):
|  | 2013 Quarters |
|  | First |  |  | Second |  |  | Third |  |  | Fourth |
Net patient service revenue |  | $ | 502,715 |  |  | $ | 529,180 |  |  | $ | 554,730 |  |  | $ | 567,387 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Practice salaries and benefits |  |  | 329,201 |  |  |  | 331,922 |  |  |  | 346,879 |  |  |  | 353,316 |
Practice supplies and other operating expenses |  |  | 19,500 |  |  |  | 19,416 |  |  |  | 19,445 |  |  |  | 24,027 |
General and administrative expenses |  |  | 53,318 |  |  |  | 54,601 |  |  |  | 54,654 |  |  |  | 55,636 |
Depreciation and amortization |  |  | 9,144 |  |  |  | 9,870 |  |  |  | 10,461 |  |  |  | 10,491 |
Total operating expenses |  |  | 411,163 |  |  |  | 415,809 |  |  |  | 431,439 |  |  |  | 443,470 |
Income from operations |  |  | 91,552 |  |  |  | 113,371 |  |  |  | 123,291 |  |  |  | 123,917 |
Investment income |  |  | 402 |  |  |  | 396 |  |  |  | 372 |  |  |  | 526 |
Interest expense |  |  | (1,189 | ) |  |  | (1,673 | ) |  |  | (1,507 | ) |  |  | (1,046 | )
Income before income taxes |  |  | 90,765 |  |  |  | 112,094 |  |  |  | 122,156 |  |  |  | 123,397 |
Income tax provision |  |  | 35,398 |  |  |  | 42,876 |  |  |  | 45,198 |  |  |  | 44,423 |
Net income |  | $ | 55,367 |  |  | $ | 69,218 |  |  | $ | 76,958 |  |  | $ | 78,974 |
Per common and common equivalent share data (1): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.56 |  |  | $ | 0.70 |  |  | $ | 0.77 |  |  | $ | 0.79 |
Diluted |  | $ | 0.55 |  |  | $ | 0.68 |  |  | $ | 0.76 |  |  | $ | 0.78 |
Weighted average shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 98,618 |  |  |  | 99,116 |  |  |  | 99,506 |  |  |  | 99,469 |
Diluted |  |  | 100,784 |  |  |  | 101,098 |  |  |  | 101,178 |  |  |  | 101,080 |
(1) | Basic and diluted per share amounts are computed for each of the periods presented. Accordingly, the sum of the quarterly per share amounts may not agree with the full year amount.
|  | 2012 Quarters |
|  | First |  |  | Second |  |  | Third |  |  | Fourth |
Net patient service revenue |  | $ | 422,616 |  |  | $ | 449,530 |  |  | $ | 473,134 |  |  | $ | 471,332 |
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Practice salaries and benefits |  |  | 272,261 |  |  |  | 275,951 |  |  |  | 292,030 |  |  |  | 290,671 |
Practice supplies and other operating expenses |  |  | 16,985 |  |  |  | 17,956 |  |  |  | 17,606 |  |  |  | 19,276 |
General and administrative expenses |  |  | 46,869 |  |  |  | 48,200 |  |  |  | 48,200 |  |  |  | 50,271 |
Depreciation and amortization |  |  | 7,113 |  |  |  | 7,687 |  |  |  | 7,925 |  |  |  | 8,091 |
Total operating expenses |  |  | 343,228 |  |  |  | 349,794 |  |  |  | 365,761 |  |  |  | 368,309 |
Income from operations |  |  | 79,388 |  |  |  | 99,736 |  |  |  | 107,373 |  |  |  | 103,023 |
Investment income |  |  | 428 |  |  |  | 365 |  |  |  | 422 |  |  |  | 681 |
Interest expense |  |  | (554 | ) |  |  | (848 | ) |  |  | (624 | ) |  |  | (1,219 | )
Income before income taxes |  |  | 79,262 |  |  |  | 99,253 |  |  |  | 107,171 |  |  |  | 102,485 |
Income tax provision |  |  | 30,912 |  |  |  | 38,709 |  |  |  | 41,261 |  |  |  | 36,382 |
Net income |  | $ | 48,350 |  |  | $ | 60,544 |  |  | $ | 65,910 |  |  | $ | 66,103 |
Per common and common equivalent share data (1): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  | $ | 0.50 |  |  | $ | 0.62 |  |  | $ | 0.67 |  |  | $ | 0.67 |
Diluted |  | $ | 0.49 |  |  | $ | 0.61 |  |  | $ | 0.66 |  |  | $ | 0.66 |
Weighted average shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic |  |  | 96,538 |  |  |  | 97,086 |  |  |  | 97,876 |  |  |  | 98,226 |
Diluted |  |  | 98,798 |  |  |  | 99,090 |  |  |  | 99,618 |  |  |  | 100,212 |
(1) | Basic and diluted per share amounts are computed for each of the periods presented. Accordingly, the sum of the quarterly per share amounts may not agree with the full year amount.

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- Definition Tabular disclosure of the quarterly financial data in the annual financial statements. The disclosure includes financial information for each fiscal quarter for the current and previous year, including revenues, gross profit, income (loss) before extraordinary items and cumulative effect of a change in accounting principle and earnings per share data. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 270 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a)-(j) -URI http://asc.fasb.org/extlink&oid=25249566&loc=d3e1280-108306 + Details
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