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Income Taxes Other information (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Tax (Textual) [Abstract]      
Income taxes paid $ 100 $ 200 $ 200
Income tax refunds received   100 700
Increase in deferred tax asset valuation allowance 200 800 1,600
Operating Loss Carryforwards [Line Items]      
Tax Adjustments, Settlements, and Unusual Provisions 800 1,300  
Goodwill 300    
Income Tax Expense (Benefit) 500    
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance at beginning of year 2,964 2,678  
Additions for tax positions of current year 146 287  
Additions for tax positions of prior years 26 133  
Reductions for tax positions of prior years 0 (134)  
Balance at end of year 3,136 $ 2,964 $ 2,678
State      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards 48,500    
Foreign      
Operating Loss Carryforwards [Line Items]      
Tax credit carryforwards 500    
US Federal      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforwards $ 49,800