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Income Taxes (Details 7) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Valuation Allowance [Line Items]
Balance at beginning of year	$ 51,242	$ 44,320	$ 40,966
Additions -Charges to earnings	6,153	7,077	6,640
Deductions-Charges to earnings	(331)	(275)	0
Expiration And Forfeitures	(1,481)	(998)	(2,141)
Others (Note)	3,360	1,118	(1,145)
Balance at end of year	$ 58,943	$ 51,242	$ 44,320

X

- Definition

The amount of deductions for allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

+ References

No definition available.

+ Details

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X

- Definition

The amount of changes to earning for allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

+ References

No definition available.

+ Details

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X

- Definition

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards that are subject to expiration dates and forfeitures.

+ References

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- Definition

The amount of other notes for allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences not separately disclosed.

+ References

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X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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