Income Taxes (Deferred tax assets and liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Deferred Tax Assets, Net, Current Classification [Abstract]
Inventory cost	$ 6,113	$ 6,158
Accrued expenses and accounts receivable	2,422	2,047
Share based compensation and others	1,978	1,790
Total deferred tax assets, current	10,513	9,995
Deferred Tax Assets, Net, Noncurrent Classification [Abstract]
Foreign tax credits	20,911	20,537
Research and development tax credits	5,460	4,331
Net operating loss carryforwards	13,130	13,977
Accrued pension	17,110	10,089
Share based compensation and others	18,371	21,811
Total deferred tax assets, include valuation allowance	74,982	70,745
valuation allowances	(35,908)	(27,022)
Total deferred tax assets, non-current	39,074	43,723
Deferred tax liabilities, non-current
Plant, equipment and intangible assets	(10,837)	(6,904)
Total deferred tax liabilities, non-current	(10,837)	(6,904)
Total deferred tax assets, non-current	$ 28,237	$ 36,819