Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Deferred tax assets
Inventory cost	$ 7,944	$ 6,878
Accrued expenses and accounts receivable	2,206	2,042
Foreign tax credits	20,133	19,806
Research and development tax credits	12,306	6,034
Net operating loss carryforwards	25,878	14,706
Accrued pension	7,169	22,283
Share based compensation and others	18,238	20,655
Total deferred tax assets, include valuation allowance	93,874	92,404
Valuation allowances	(35,738)	(41,163)
Total deferred tax assets, non-current	58,136	51,241
Deferred tax liabilities
Plant, equipment and intangible assets	(39,722)	(3,334)
Total deferred tax liabilities, non-current	(39,722)	(3,334)
Net deferred tax assets	$ 18,414	$ 47,907