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Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Dec. 31, 2015
Accrued Expenses and Other Current Liabilities    
Payroll and related benefits $ 30,306 $ 30,917
Warranty 7,104 8,159
Professional fees 2,378 2,224
Installation 1,373 1,110
Sales, use, and other taxes 1,264 1,132
Restructuring liability 437 824
Other 3,456 5,027
Total $ 46,318 $ 49,393
Warranty period of products purchased 1 year  
Accrued Warranty    
Balance as of the beginning of period $ 8,159  
Warranties issued 1,221  
Consumption of reserves (2,095)  
Changes in estimate (181)  
Balance as of the end of period $ 7,104