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Selected Quarterly Financial Data (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Summary of Selected Quarterly Financial Data                      
Net patient revenues $ 61,110 $ 60,782 $ 62,052 $ 60,499 $ 58,697 $ 57,332 $ 56,678 $ 53,872 $ 244,443 $ 226,579 $ 204,101
Net revenues 62,694 62,853 63,959 62,582 60,678 59,675 59,912 56,741 252,088 237,006 211,233
Income from operations 8,062 9,392 10,598 9,871 12,987 8,507 10,775 8,611 37,252 40,880 33,540
Net income including noncontrolling interests 5,887 6,298 7,314 6,812 10,142 5,853 7,603 6,185 26,218 29,783 24,700
Net income attributable to common shareholders $ 4,084 $ 4,563 $ 4,849 $ 4,478 $ 8,229 $ 4,099 $ 4,900 $ 3,746 $ 17,933 $ 20,974 $ 15,645
Earnings per common share:                      
Basic - net income attributable to common shareholders $ 0.34 $ 0.39 $ 0.41 $ 0.38 $ 0.70 $ 0.35 $ 0.42 $ 0.32 $ 1.52 $ 1.78 $ 1.34
Diluted - net income attributable to common shareholders $ 0.34 $ 0.38 $ 0.41 $ 0.38 $ 0.69 $ 0.34 $ 0.41 $ 0.31 $ 1.51 $ 1.75 $ 1.32
Shares used in computation:                      
Basic 11,911 11,827 11,781 11,726 11,786 11,886 11,807 11,718 11,804 11,814 11,638
Diluted 12,013 11,928 11,903 11,838 11,892 12,011 11,999 11,945 11,904 11,977 11,870