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Consolidated Statements of Income (USD $) In Thousands, except Per Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Income Statement [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net patient service revenue | $ 567,387 | $ 554,730 | $ 529,180 | $ 502,715 | $ 471,332 | $ 473,134 | $ 449,530 | $ 422,616 | $ 2,154,012 | $ 1,816,612 | $ 1,588,248
Operating expenses: |  |  |  |  |  |  |  |  |  |  |
Practice salaries and benefits | 353,316 | 346,879 | 331,922 | 329,201 | 290,671 | 292,030 | 275,951 | 272,261 | 1,361,318 | 1,130,913 | 970,396
Practice supplies and other operating expenses | 24,027 | 19,445 | 19,416 | 19,500 | 19,276 | 17,606 | 17,956 | 16,985 | 82,388 | 71,823 | 66,815
General and administrative expenses | 55,636 | 54,654 | 54,601 | 53,318 | 50,271 | 48,200 | 48,200 | 46,869 | 218,209 | 193,540 | 170,356
Depreciation and amortization | 10,491 | 10,461 | 9,870 | 9,144 | 8,091 | 7,925 | 7,687 | 7,113 | 39,966 | 30,816 | 25,292
Total operating expenses | 443,470 | 431,439 | 415,809 | 411,163 | 368,309 | 365,761 | 349,794 | 343,228 | 1,701,881 | 1,427,092 | 1,232,859
Income from operations | 123,917 | 123,291 | 113,371 | 91,552 | 103,023 | 107,373 | 99,736 | 79,388 | 452,131 | 389,520 | 355,389
Investment income | 526 | 372 | 396 | 402 | 681 | 422 | 365 | 428 | 1,696 | 1,896 | 1,495
Interest expense | (1,046) | (1,507) | (1,673) | (1,189) | (1,219) | (624) | (848) | (554) | (5,415) | (3,245) | (3,639)
Income before income taxes | 123,397 | 122,156 | 112,094 | 90,765 | 102,485 | 107,171 | 99,253 | 79,262 | 448,412 | 388,171 | 353,245
Income tax provision | 44,423 | 45,198 | 42,876 | 35,398 | 36,382 | 41,261 | 38,709 | 30,912 | 167,895 | 147,264 | 135,248
Net income | $ 78,974 | $ 76,958 | $ 69,218 | $ 55,367 | $ 66,103 | $ 65,910 | $ 60,544 | $ 48,350 | $ 280,517 | $ 240,907 | $ 217,997
Net income: |  |  |  |  |  |  |  |  |  |  |
Basic | $ 0.79 | $ 0.77 | $ 0.70 | $ 0.56 | $ 0.67 | $ 0.67 | $ 0.62 | $ 0.50 | $ 2.83 | $ 2.47 | $ 2.28
Diluted | $ 0.78 | $ 0.76 | $ 0.68 | $ 0.55 | $ 0.66 | $ 0.66 | $ 0.61 | $ 0.49 | $ 2.78 | $ 2.42 | $ 2.23
Weighted average shares: |  |  |  |  |  |  |  |  |  |  |
Basic | 99,469 | 99,506 | 99,116 | 98,618 | 98,226 | 97,876 | 97,086 | 96,538 | 99,112 | 97,386 | 95,412
Diluted | 101,080 | 101,178 | 101,098 | 100,784 | 100,212 | 99,618 | 99,090 | 98,798 | 100,969 | 99,382 | 97,592

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