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Income Taxes Summary of Loss and Tax Credit Carryforwards (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Jan. 01, 2017
Income Tax Contingency [Line Items]    
Valuation Allowance, Amount $ 68,895 $ 65,640
State and Local Jurisdiction [Member]    
Income Tax Contingency [Line Items]    
Operating Loss Carryforwards 198,600  
Tax Credit Carryforward, Amount 6,000  
Foreign Tax Authority [Member]    
Income Tax Contingency [Line Items]    
Operating Loss Carryforwards 263,100  
Tax Credit Carryforward, Amount 100  
Internal Revenue Service (IRS) [Member]    
Income Tax Contingency [Line Items]    
Operating Loss Carryforwards 40,600  
General Business [Member]    
Income Tax Contingency [Line Items]    
Tax Credit Carryforward, Amount $ 100  
Minimum [Member] | Internal Revenue Service (IRS) [Member]    
Income Tax Contingency [Line Items]    
Tax Credit Carryforward, Expiration Date Jan. 01, 2018  
Maximum [Member] | Internal Revenue Service (IRS) [Member]    
Income Tax Contingency [Line Items]    
Tax Credit Carryforward, Expiration Date Dec. 31, 2037