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Leases - Narrative (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) factory | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Operating Leased Assets [Line Items] |  |  |
Rent expense | $ 4,900 | $ 4,200 | $ 4,000
Liability related to rent escalations | 1,100 | 1,200 |
Allowance for moving expenses and tenant improvements | 1,800 |  |
Net book value of asset | $ 95,840 | 110,962 |
People's Republic of China (PRC) |  |  |
Operating Leased Assets [Line Items] |  |  |
Number of factories | factory | 1 |  |
Net book value of asset | $ 76,400 | $ 93,600 |
Yangzhou |  |  |
Operating Leased Assets [Line Items] |  |  |
Net book value of prepaid lease | $ 2,500 |  |
Prepaid lease assets, remaining amortization period | 40 years |  |
Yangzhou | Buildings on Prepaid Land |  |  |
Operating Leased Assets [Line Items] |  |  |
Net book value of asset | $ 18,200 |  |
Remaining depreciable period of asset | 21 years |  |
Property Subject to Rent Escalations | Minimum |  |  |
Operating Leased Assets [Line Items] |  |  |
Term of lease | 48 months |  |
Property Subject to Rent Escalations | Maximum |  |  |
Operating Leased Assets [Line Items] |  |  |
Term of lease | 125 months |  |

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