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Income Taxes - 2017 Tax Act (Details) - USD ($)
$ in Thousands
12 Months Ended
Jan. 01, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Taxes        
Income tax expense (benefit)   $ (36,107) $ 2,766 $ 9,332
Income Tax benefit related to domestic losses   $ 24,200    
U.S. federal statutory rate (as a percent) 21.00% 35.00%    
income tax benefit   $ 4,800    
Amount of reduction in net deferred tax assets   25,600    
Reduction in Valuation allowance   30,400    
Accumulated undistributed earnings by foreign subsidiaries   155,800    
Transition tax on foreign earnings   140,200    
Income tax benefit related to valuation allowance   $ 6,500