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Commitments and Contingencies Extended Warranty (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Less: current portion of unearned revenue for extended warranty | $ 74,598 |  | $ 74,598 |  | $ 64,976
Extended Warranty [Member] |  |  |  |  |
Beginning balance | 30,271 | $ 33,068 | 31,549 | $ 33,654 |
Unearned revenue for new extended warranties | 302 | 352 | 1,006 | 1,366 |
Unearned revenue recognized | (1,096) | (905) | (3,163) | (2,640) |
Effect of change in exchange rates | 121 | (31) | 206 | 104 |
Ending balance | 29,598 | 32,484 | 29,598 | 32,484 |
Less: current portion of unearned revenue for extended warranty | 4,305 | 4,134 | 4,305 | 4,134 |
Long-term unearned revenue for extended warranty within other long-term obligations | $ 25,293 | $ 28,350 | $ 25,293 | $ 28,350 |

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