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Inventories (Tables) | 9 Months Ended
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Sep. 30, 2013
Inventory Disclosure [Abstract] |
Changes in Inventory Reserves | Changes in our inventory reserves are as follows:
|  | Nine Months Ended |  |  | Three Months Ended |
|  | September 30, |  |  | September 30, |
|  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
|  | (In Thousands) |
Balance at beginning of period |  | $ | 2,793 |  |  | $ | 1,783 |  |  | $ | 2,509 |  |  | $ | 1,737 |
Provisions for losses |  |  | 1,134 |  |  |  | 337 |  |  |  | 899 |  |  |  | 293 |
Write-offs and disposals |  |  | (519 | ) |  |  | (93 | ) |  |  | — |  |  |  | (3 | )
Balance at end of period |  | $ | 3,408 |  |  | $ | 2,027 |  |  | $ | 3,408 |  |  | $ | 2,027 |

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