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Discontinued Operations Assets and Liabilities of Discontinued Operations (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Jun. 30, 2016
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Cash and cash equivalents $ 6,214 $ 7,564 $ 8,145
Accounts and other receivables, net 1,339 1,670  
Inventories 505 167  
Current assets of discontinued operations 8,058 9,401  
Other assets 71 70  
Deferred income tax assets 15,560 15,560  
Non-current assets of discontinued operations 15,631 15,630  
Accounts payable and other accrued expenses 1,186 3,684  
Accrued warranty 7,785 9,254  
Accrued restructuring 214 481  
Current liabilities of discontinued operations 9,185 13,419  
Accrued warranty 18,016 20,976  
Other liabilities 224 181  
Non-current liabilities of discontinued operations $ 18,240 $ 21,157