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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2016
Property, Plant and Equipment [Abstract]  
Property, Plant and Equipment
Property, Plant and Equipment
Property, plant and equipment, including equipment acquired under capital lease obligations, are summarized as follows as of December 31, 2016 and 2015:
(in thousands)
Estimated useful life
(in years)
 
2016
 
2015
Land
—

 
$
16,327

 
$
15,452

Buildings and improvements
5-40

 
301,092

 
302,068

Machinery and equipment
3-10

 
257,349

 
253,556

Computer software
3-7

 
176,227

 
125,396

Furniture and office equipment
3-10

 
89,560

 
92,281

Construction in progress
—

 
47,260

 
63,825

 
 
 
887,815

 
852,578

Less: Accumulated depreciation and amortization
 
 
(451,160
)
 
(409,634
)
Property, plant and equipment, net
 
 
$
436,655

 
$
442,944


Amortization of assets acquired under capital lease obligations is included within accumulated depreciation and amortization above for the years ended December 31, 2016 and 2015, respectively. For the years ended December 31, 2016, 2015 and 2014 depreciation and amortization expense totaled $75.1 million, $59.5 million and $67.9 million, respectively. For the years ended December 31, 2016, 2015 and 2014 amortization related to computer software to be sold, leased or marketed totaled $9.3 million, $5.1 million and $6.2 million, respectively.
In 2016, we recorded asset impairment charges of $10.9 million related to the restructuring charge discussed in Note 6. Impairments included $7.5 million of computer software to be sold, leased or marketed, $1.7 million in machinery and equipment, $1.5 million in internal-use software, $0.1 million in furniture and office equipment and $0.1 million in buildings and improvements. In 2015, we recorded asset impairment charges of $3.1 million, of which $1.0 million related to computer software to be sold, leased or marketed related to the abandonment of certain projects following the acquisition of MO BIO.
Repairs and maintenance expense was $13.0 million, $15.4 million and $15.9 million in 2016, 2015 and 2014, respectively. For the year ended December 31, 2016 and 2015, construction in progress primarily includes amounts related to ongoing software development projects. For the years ended December 31, 2016, 2015 and 2014, interest capitalized in connection with construction projects was not significant.