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Summary of Signficant Accounting Policies Property, Plant and Equipment [Table Text Block] (Tables)
12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Policy [Policy Text Block]
Property, Plant and Equipment
Property, plant and equipment are recorded at cost less accumulated depreciation. Expenditures for major additions and improvements that extend the useful life of the related asset are capitalized. As property, plant and equipment are sold or retired, the applicable cost and accumulated depreciation are removed from the accounts and any resulting gain or loss thereon is recognized. Construction in progress consists primarily of building and land improvements at our existing facilities. Depreciation is calculated using the straight-line method over the estimated useful lives or, in the case of leasehold improvements, the term of the related lease and reasonably assured renewal periods, if shorter.
Our estimated useful lives are as follows:
Land improvements
10-20 years
Buildings and improvements
20-40 years
Machinery and equipment
3-20 years
Computer equipment and software
3-10 years
Vehicles and trailers
3-10 years
Furniture and fixtures
5-7 years

Property, plant and equipment consists of the following (in thousands):
 
December 31,
 
2019
 
2018
Land and improvements
$
194,437

 
$
177,998

Buildings and improvements
384,918

 
351,733

Machinery and equipment
679,292

 
617,424

Computer equipment and software
153,900

 
143,547

Vehicles and trailers
156,334

 
150,824

Furniture and fixtures
52,601

 
58,919

Leasehold improvements
295,534

 
278,687

Finance lease assets
71,724

 
61,310

 
1,988,740

 
1,840,442

Less—Accumulated depreciation
(807,680
)
 
(685,751
)
Construction in progress
53,340

 
65,471

Total property, plant and equipment, net
$
1,234,400

 
$
1,220,162


We record depreciation expense associated with our refurbishing, remanufacturing, manufacturing and furnace operations as well as our distribution centers in Cost of goods sold in the Consolidated Statements of Income. We report depreciation expense resulting from restructuring programs in Restructuring and acquisition related expenses. All other depreciation expense is reported in Depreciation and amortization. Total depreciation expense for the years ended December 31, 2019, 2018, and 2017 was $174 million, $157 million, and $129 million, respectively.
Property, Plant and Equipment [Table Text Block]
Property, plant and equipment consists of the following (in thousands):
 
December 31,
 
2019
 
2018
Land and improvements
$
194,437

 
$
177,998

Buildings and improvements
384,918

 
351,733

Machinery and equipment
679,292

 
617,424

Computer equipment and software
153,900

 
143,547

Vehicles and trailers
156,334

 
150,824

Furniture and fixtures
52,601

 
58,919

Leasehold improvements
295,534

 
278,687

Finance lease assets
71,724

 
61,310

 
1,988,740

 
1,840,442

Less—Accumulated depreciation
(807,680
)
 
(685,751
)
Construction in progress
53,340

 
65,471

Total property, plant and equipment, net
$
1,234,400

 
$
1,220,162