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