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Leases - Prepaid Leases (Details) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 USD ($) factory | Dec. 31, 2015 USD ($)
Operating Leased Assets [Line Items] |  |
Net book value of asset | $ 105,351 | $ 90,015
People's Republic of China (PRC) |  |
Operating Leased Assets [Line Items] |  |
Number of factories | factory | 2 |
Net book value of asset | $ 90,000 | $ 79,400
Guangzhou |  |
Operating Leased Assets [Line Items] |  |
Net book value of prepaid lease | $ 1,100 |
Prepaid lease assets, remaining amortization period | 14 years |
Guangzhou | Buildings on Prepaid Land |  |
Operating Leased Assets [Line Items] |  |
Net book value of asset | $ 11,200 |
Asset, remaining depreciable period | 16 years |
Yangzhou |  |
Operating Leased Assets [Line Items] |  |
Net book value of prepaid lease | $ 2,600 |
Prepaid lease assets, remaining amortization period | 42 years |
Yangzhou | Buildings on Prepaid Land |  |
Operating Leased Assets [Line Items] |  |
Net book value of asset | $ 20,800 |
Asset, remaining depreciable period | 23 years |

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