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Inventories (Tables) | 12 Months Ended
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Dec. 31, 2016
Inventory Disclosure [Abstract] |
Schedule of Inventory | The Company's significant components of inventory at December 31, 2016 and 2015 were as follows (in thousands):
| December 31, 2016 |  | December 31, 2015
Raw materials and parts | $ | 106,329 |  |  | $ | 148,372 |
Work in process | 23,303 |  |  | 38,381 |
Finished goods | 277,303 |  |  | 315,256 |
Gross inventories | 406,935 |  |  | 502,009 |
Inventory reserve | (68,352 | ) |  | (77,888 | )
Inventories | $ | 338,583 |  |  | $ | 424,121 |
Schedule of Inventory Reserve | The change in the amounts of the inventory reserve during the three year period ended December 31, 2016 is as follows (in thousands):
Period ended |  | Balance at beginning of period |  | Charged to expense |  | Deductions or other |  | Balance at end of period
December 31, 2014 |  | $ | 26,419 |  |  | $ | 8,171 |  |  | $ | (5,134 | ) |  | $ | 29,456 |
December 31, 2015 |  | 29,456 |  |  | 51,917 |  |  | (3,485 | ) |  | $ | 77,888 |
December 31, 2016 |  | 77,888 |  |  | 25,537 |  |  | (35,073 | ) |  | $ | 68,352 |

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