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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2013
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, 2013, are as follows (in thousands):
 
Operating Leases
Year ending December 31,
 
2014
$
9,803

2015
9,327

2016
8,087

2017
7,676

2018
7,620

Thereafter
13,574

Total minimum payments
$
56,087
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,
 
2013
 
2012
 
2011
Balance at beginning of period
$
4,292

 
$
5,558

 
$
4,811

Transfer to Aurora as part of the sale of discontinued operations
(939
)
 
—

 
—

Accrual for current period warranties
7,158

 
5,798

 
8,245

Warranty costs incurred
(6,905
)
 
(7,064
)
 
(7,498
)
Balance at end of period
$
3,606

 
$
4,292

 
$
5,558