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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2015
Commitments and Contingencies Disclosure [Abstract]  
Future Minimum Lease Payments Under Noncancelable Operating Leases
Future minimum lease payments under non-cancelable operating leases at December 31, 2015, are as follows (in thousands):
 
Operating Leases
Year ending December 31,
 
2016
$
10,784

2017
10,247

2018
9,741

2019
8,355

2020
5,734

Thereafter
676

Total minimum payments
$
45,537
Summary of Warranty Accrual Included in Accrued Liabilities
Activity for the Company’s warranty accrual, which is included in accrued liabilities, is summarized below (in thousands):
 
Year ended December 31,
 
2015
 
2014
 
2013
Balance at beginning of period
$
4,242

 
$
3,606

 
$
4,292

   Transfer to Aurora as part of the sale of discontinued operations
—

 
—

 
(939
)
   Accrual for current period warranties
5,470

 
7,278

 
7,192

   Changes in liability related to pre-existing warranties
(92
)
 
3

 
(35
)
   Warranty costs incurred
(5,707
)
 
(6,645
)
 
(6,904
)
Balance at end of period
$
3,913

 
$
4,242

 
$
3,606