Non-cash investing and financing activities during the years ended December 31, 2013, 2012 and 2011 were as follows (in thousands):
| 2013 | 2012 | 2011 | ||||||||||
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Business acquisitions, including contingent consideration earned |
$ | 2,417 | $ | 11,849 | $ | 19,601 | ||||||
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Estimated contingent purchase price payable |
$ | 5,288 | $ | 15,659 | $ | 9,735 | ||||||
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