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Financial Instruments (Details 3) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2017 USD ($)
NTD [Member] | Financial liabilities [Member]
Foreign currency	$ 922,148	$ 780,899	$ 943,995
Exchange rate	30.715	29.76	32.25
Functional currency	$ 30,023	$ 26,240	$ 29,271
NTD [Member] | Financial assets [Member]
Foreign currency	$ 205,394	$ 159,194	$ 159,824
Exchange rate	30.715	29.76	32.25
Functional currency	$ 6,687	$ 5,349	$ 4,956
CNY [Member] | Financial assets [Member]
Foreign currency	$ 33,590	$ 32,330	$ 31,240
Exchange rate	6.8681	6.52	6.99
Functional currency	$ 4,891	$ 4,959	$ 4,470

X

- Definition

Amount represents the functional currency

+ References

No definition available.

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X

- Definition

The average exchange rate used by the entity. Exchange rate is the ratio of exchange for two currencies.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2018-01-01
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- Definition

The net gain arising from foreign exchange differences. [Refer: Foreign exchange gain (loss)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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-IssueDate 2018-01-01
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