Income Taxes (Deferred tax assets and liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets, current
Inventory cost	$ 6,878us-gaap_DeferredTaxAssetsInventory	$ 6,113us-gaap_DeferredTaxAssetsInventory
Accrued expenses and accounts receivable	2,042	2,422
Share based compensation and others	2,375	1,978
Total deferred tax assets, current	11,295us-gaap_DeferredTaxAssetsNetCurrent	10,513us-gaap_DeferredTaxAssetsNetCurrent
Deferred tax assets, non-current
Foreign tax credits	19,806	20,911
Research and development tax credits	6,034	5,460
Net operating loss carryforwards	14,706	13,130
Accrued pension	22,283	17,110
Share based compensation and others	18,280	18,371
Total deferred tax assets, include valuation allowance	81,109	74,982
Valuation allowances	(41,163)	(35,908)
Total deferred tax assets, non-current	39,946us-gaap_DeferredTaxAssetsNetNoncurrent	39,074us-gaap_DeferredTaxAssetsNetNoncurrent
Deferred tax liabilities, non-current
Plant, equipment and intangible assets	(3,334)	(10,837)
Total deferred tax liabilities, non-current	(3,334)	(10,837)
Net deferred tax assets, non-current	$ 36,612	$ 28,237

The current portion of the aggregate tax effect as of the balance sheet date of the amount of the estimated future tax deductions arising from equity-based compensation costs, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient tax-basis income is generated in future periods to enable the deduction to be taken.

No definition available.