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Income Taxes (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax [Line Items]      
Expected income tax expense $ 5,587 $ 14,534 $ 12,818
Tax on undistributed retained earnings 3,011 6,814 4,700
Tax-exempted income (1,759) (2,843) (2,392)
Tax benefit resulting from setting aside legal reserve from prior year’s income (839) (651) (558)
Realized tax losses on investments in subsidiaries due to capital reduction to offset the accumulated deficit (2,157) (489) 0
Increase in investment tax credits (4,242) (4,525) 0
Increase in deferred tax asset valuation allowance 6,640 4,038 3,146
Changes in unrecognized tax benefits related to prior year tax positions, net of its impact to tax-exempted income 915 305 (215)
Tax effect resulting from foreign currency matters 3,583 5,593 2,278
Foreign tax rate differential (454) (2,143) 612
Variance from audits, amendments and examinations of prior years’ income tax filings 793 37 (1,376)
Others 327 921 463
Actual income tax expense $ 11,405 $ 21,591 $ 19,476