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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, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2010 | Sep. 30, 2010 | Jun. 30, 2010 | Mar. 31, 2010 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Consolidated Statements Of Income [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net patient service revenue | $ 404,898 |  | $ 407,665 |  | $ 393,402 |  | $ 382,283 |  | $ 368,480 |  | $ 351,058 |  | $ 349,094 |  | $ 332,927 |  | $ 1,588,248 | $ 1,401,559 | $ 1,288,264
Operating expenses: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Practice salaries and benefits | 244,523 |  | 246,687 |  | 235,292 |  | 243,894 |  | 220,872 |  | 211,884 |  | 208,762 |  | 213,402 |  | 970,396 | 854,920 | 783,493
Practice supplies and other operating expenses | 18,754 |  | 16,718 |  | 16,253 |  | 15,090 |  | 16,374 |  | 13,980 |  | 14,062 |  | 13,095 |  | 66,815 | 57,511 | 52,232
General and administrative expenses | 42,846 |  | 43,010 |  | 42,702 |  | 41,798 |  | 39,505 |  | 37,499 |  | 39,164 |  | 38,099 |  | 170,356 | 154,267 | 147,162
Depreciation and amortization | 7,266 |  | 6,213 |  | 6,032 |  | 5,781 |  | 5,843 |  | 6,321 |  | 5,006 |  | 4,780 |  | 25,292 | 21,950 | 16,448
Total operating expenses | 313,389 |  | 312,628 |  | 300,279 |  | 306,563 |  | 282,594 |  | 269,684 |  | 266,994 |  | 269,376 |  | 1,232,859 | 1,088,648 | 999,335
Income from operations | 91,509 |  | 95,037 |  | 93,123 |  | 75,720 |  | 85,886 |  | 81,374 |  | 82,100 |  | 63,551 |  | 355,389 | 312,911 | 288,929
Investment income | 504 |  | 337 |  | 329 |  | 325 |  | 327 |  | 438 |  | 265 |  | 404 |  | 1,495 | 1,434 | 1,682
Interest expense | (684) |  | (1,056) |  | (988) |  | (911) |  | (884) |  | (481) |  | (1,118) |  | (710) |  | (3,639) | (3,193) | (2,911)
Income before income taxes | 91,329 |  | 94,318 |  | 92,464 |  | 75,134 |  | 85,329 |  | 81,331 |  | 81,247 |  | 63,245 |  | 353,245 | 311,152 | 287,700
Income tax provision | 32,970 |  | 36,077 |  | 36,523 |  | 29,678 |  | 31,529 |  | 20,061 |  | 31,889 |  | 24,982 |  | 135,248 | 108,461 | 111,896
Net income | $ 58,359 |  | $ 58,241 |  | $ 55,941 |  | $ 45,456 |  | $ 53,800 |  | $ 61,270 |  | $ 49,358 |  | $ 38,263 |  | $ 217,997 | $ 202,691 | $ 175,804
Net income: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | $ 1.21 | [1] | $ 1.21 | [1] | $ 1.18 | [1] | $ 0.96 | [1] | $ 1.15 | [1] | $ 1.31 | [1] | $ 1.06 | [1] | $ 0.83 | [1] | $ 4.57 | $ 4.35 | $ 3.86
Diluted | $ 1.19 | [1] | $ 1.19 | [1] | $ 1.15 | [1] | $ 0.94 | [1] | $ 1.12 | [1] | $ 1.29 | [1] | $ 1.04 | [1] | $ 0.81 | [1] | $ 4.47 | $ 4.26 | $ 3.78
Weighted average shares: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Basic | 48,126 | [1] | 47,990 | [1] | 47,531 | [1] | 47,149 | [1] | 46,914 | [1] | 46,788 | [1] | 46,516 | [1] | 46,300 | [1] | 47,706 | 46,630 | 45,573
Diluted | 49,132 | [1] | 48,935 | [1] | 48,730 | [1] | 48,361 | [1] | 47,998 | [1] | 47,482 | [1] | 47,528 | [1] | 47,267 | [1] | 48,796 | 47,570 | 46,471
[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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