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Long-Lived Assets
6 Months Ended
Jul. 02, 2017
Property, Plant and Equipment [Abstract]  
Long-Lived Assets
Long-Lived Assets

Depreciation and Amortization Expense

We recognized depreciation expense of $11.5 million and $22.9 million in the three and six months ended July 2, 2017, respectively. We recognized depreciation expense of $12.0 million and $23.7 million in the three and six months ended July 3, 2016, respectively. 

In connection with the segment change discussed in Note 4, we re-evaluated the useful life of the Tripwire trademark and concluded that an indefinite life is no longer appropriate. We have estimated a useful life of 10 years and will re-evaluate this estimate if and when our expected use of the Tripwire trademark changes. We began amortizing the Tripwire trademark in the first quarter of 2017, which resulted in amortization expense of $0.8 million and $1.6 million for the three and six months ended July 2, 2017, respectively. As of July 2, 2017, the net book value of the Tripwire trademark was $29.4 million.

We recognized amortization expense related to our intangible assets of $27.1 million and $50.8 million in the three and six months ended July 2, 2017, respectively. We recognized amortization expense related to our intangible assets of $26.3 million and $51.8 million in the three and six months ended July 3, 2016, respectively.