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CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY (Parenthetical) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |
Issuance of shares in connection with acquisitions (in shares) | 19,685 | 35,714 | 498,730
Issuance of shares upon conversion of notes to common stock (in shares) |  |  | 493,791
Exercise of stock options and vesting of restricted stock for common stock (in shares) | 75,419 | 68,069 | 149,886
Acquisition of treasury stock (in shares) | 76,300 | 65,171 |

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