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Selected Quarterly Financial Data (Unaudited) - Summary of Selected Quarterly Financial Data (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2014 | Sep. 30, 2014 | Jun. 30, 2014 | Mar. 31, 2014 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Selected Quarterly Financial Data (Unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |  |
Net patient revenues | $ 84,881 | $ 82,154 | $ 81,451 | $ 75,807 | $ 77,958 | $ 76,184 | $ 76,470 | $ 68,397 | $ 324,293 | $ 299,009 | $ 258,283
Net revenues | 86,724 | 84,049 | 83,288 | 77,241 | 79,390 | 77,716 | 78,201 | 69,767 | 331,302 | 305,074 | 264,058
Operating income | 12,611 | 11,949 | 13,549 | 9,185 | 10,755 | 11,278 | 14,221 | 9,514 | 47,294 | 45,768 | 38,770
Net income including non-controlling interests | 8,359 | 8,064 | 9,117 | 6,151 | 7,263 | 7,418 | 9,420 | 6,323 | $ 31,691 | $ 30,424 | $ 26,003
Net income attributable to common shareholders | $ 5,991 | $ 5,818 | $ 6,304 | $ 4,166 | $ 4,977 | $ 5,216 | $ 6,432 | $ 4,228 |  |  |
Basic earnings per share attributable to common shareholders: [Abstract] |  |  |  |  |  |  |  |  |  |  |
Prior to revaluation of redeemable non-controlling interests, net of tax (in dollars per share) | $ 0.48 | $ 0.47 | $ 0.51 | $ 0.34 | $ 0.41 | $ 0.43 | $ 0.53 | $ 0.35 | $ 1.80 | $ 1.71 | $ 1.45
Charges to additional-paid-in-capital - revaluation of redeemable non-controlling interests, net of tax (in dollars per share) | 0 | 0 | (0.03) | 0 | 0 | 0 | (0.01) | (0.08) |  |  |
Basic (in dollars per share) | 0.48 | 0.47 | 0.48 | 0.34 | 0.41 | 0.43 | 0.52 | 0.27 | 1.77 | 1.62 | 1.05
Diluted earnings per share attributable to common shareholders [Abstract] |  |  |  |  |  |  |  |  |  |  |
Prior to revaluation of redeemable non-controlling interests, net of tax (in dollars per share) | 0.48 | 0.47 | 0.51 | 0.34 | 0.41 | 0.43 | 0.53 | 0.35 | 1.80 | 1.71 | 1.45
Charges to additional-paid-in-capital - revaluation of redeemable non-controlling interests, net of tax (in dollars per share) | 0 | 0 | (0.03) | 0 | 0 | 0 | (0.01) | (0.08) | (0.03) | (0.09) | 0
Diluted (in dollars per share) | $ 0.48 | $ 0.47 | $ 0.48 | $ 0.34 | $ 0.41 | $ 0.43 | $ 0.52 | $ 0.27 | $ 1.77 | $ 1.62 | $ 1.05
Shares used in computation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Basic (in shares) | 12,421 | 12,421 | 12,409 | 12,313 | 12,267 | 12,244 | 12,224 | 12,129 | 12,392 | 12,217 | 12,063
Diluted (in shares) | 12,421 | 12,421 | 12,409 | 12,313 | 12,271 | 12,247 | 12,226 | 12,144 | 12,392 | 12,221 | 12,082

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