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Earnings per Share Data ("EPS") and Stock Based Compensation (Schedule of Computation of Basic and Diluted Earnings Per Share) (Details) (USD $) In Thousands, except Per Share data | 3 Months Ended | 6 Months Ended
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Jun. 30, 2011 | Jun. 30, 2010 | Jun. 30, 2011 | Jun. 30, 2010
Earnings per Share Data ("EPS") and Stock Based Compensation |  |  |  |
Net income attributable to UHS | $ 103,649 | $ 65,572 | $ 217,842 | $ 137,391
Less: Net income attributable to unvested restricted share grants | (126) | (278) | (275) | (593)
Net income attributable to UHS - basic and diluted | $ 103,523 | $ 65,294 | $ 217,567 | $ 136,798
Weighted average number of common shares - basic | 97,563 | 96,703 | 97,472 | 96,621
Net effect of dilutive stock options and grants based on the treasury stock method | 1,695 | 1,351 | 1,591 | 1,131
Weighted average number of common shares and equivalents - diluted | 99,258 | 98,054 | 99,063 | 97,752
Earnings per basic share attributable to UHS: | $ 1.06 | $ 0.68 | $ 2.23 | $ 1.42
Earnings per diluted share attributable to UHS: | $ 1.04 | $ 0.67 | $ 2.20 | $ 1.40

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