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Property and Equipment, Net
 9 Months Ended
Sep. 28, 2019
Property, Plant and Equipment [Abstract]  
Property and Equipment, Net Property and Equipment, Net
(amounts in thousands)
September 28,
2019
 
December 31,
2018
Property and equipment
$
2,006,687

 
$
1,982,301

Accumulated depreciation
(1,164,467
)
 
(1,138,898
)
Total property and equipment, net
$
842,220

 
$
843,403



We monitor all property and equipment for any indicators of potential impairment. We recorded impairment charges of $1.4 million and $2.8 million in the three and nine months ended September 28, 2019, respectively. We recorded impairment charges of $0.3 million and $0.9 million during the three and nine months ended September 29, 2018, respectively.

Depreciation expense was recorded as follows:
 
Three Months Ended
 
Nine Months Ended
(amounts in thousands)
September 28,
2019
 
September 29,
2018
 
September 28,
2019
 
September 29,
2018
Cost of sales
$
21,382

 
$
20,658

 
$
62,798

 
$
61,655

Selling, general and administrative
2,408

 
2,408

 
7,342

 
6,898

Total depreciation expense
$
23,790

 
$
23,066

 
$
70,140

 
$
68,553