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Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies Disclosure [Abstract]

Future Minimum Lease Payments Under Noncancelable Operating Leases

Future minimum lease payments under non-cancellable operating leases at December 31, 2017, are as follows (in thousands):

	Operating Leases
Year ending December 31,
2018	$	13,534
2019	12,132
2020	8,716
2021	2,958
2022	2,497
Thereafter	9,145
Total minimum payments	$	48,982

Summary of Warranty Accrual Included in Accrued Liabilities

Activities for the Company’s warranty accrual for each fiscal year, which is included in accrued and other current liabilities, is summarized below (in thousands):

	2017				2016				2015
Balance at beginning of period	$	4,862			$	3,913			$	4,242
Accrual for current period warranties	5,117				5,482				5,378
Balance assumed from TVN acquisition	—				1,012				—
Warranty costs incurred	(5,598		)		(5,545		)		(5,707		)
Balance at end of period	$	4,381			$	4,862			$	3,913

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- Definition

Tabular disclosure of future minimum payments required in the aggregate and for each of the five succeeding fiscal years for operating leases having initial or remaining noncancelable lease terms in excess of one year and the total minimum rentals to be received in the future under noncancelable subleases as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 840
-SubTopic 20
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717

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Tabular disclosure of the changes in the guarantor's aggregate product warranty liability, including the beginning balance of the aggregate product warranty liability, the aggregate reductions in that liability for payments made (in cash or in kind) under the warranty, the aggregate changes in the liability for accruals related to product warranties issued during the reporting period, the aggregate changes in the liability for accruals related to preexisting warranties (including adjustments related to changes in estimates), and the ending balance of the aggregate product warranty liability.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 460
-SubTopic 10
-Section 50
-Paragraph 8
-URI http://asc.fasb.org/extlink&oid=68068213&loc=d3e12565-110249

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