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Revenue | 12 Months Ended
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Dec. 31, 2012
Revenue [Abstract] |
Revenue | Revenue The Company differentiates revenue and cost of revenue based on whether the source of revenue is attributable to products, rentals or services. Revenue and cost of revenue by source are as follows (in thousands):
| Year ended December 31,
| 2012 |  | 2011 |  | 2010
Revenue: |  |  |  |  |
Products | $ | 224,777 |  |  | $ | 181,417 |  |  | $ | 95,021 |
Rentals | 67,938 |  |  | 63,610 |  |  | 42,169 |
Services | 20,113 |  |  | 13,758 |  |  | 9,792 |
| $ | 312,828 |  |  | $ | 258,785 |  |  | $ | 146,982 |
Cost of Revenue: |  |  |  |  |
Products | $ | 135,367 |  |  | $ | 115,875 |  |  | $ | 60,919 |
Rentals | 30,618 |  |  | 25,971 |  |  | 20,355 |
Services | 8,051 |  |  | 4,997 |  |  | 3,517 |
Depreciation | 7,173 |  |  | 6,122 |  |  | 9,221 |
| $ | 181,209 |  |  | $ | 152,965 |  |  | $ | 94,012 |

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