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Property, Plant and Equipment
 12 Months Ended
Dec. 31, 2012
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, 2012 and 2011:
 
(in thousands)
Estimated
useful life
(in years)
 
2012
 
2011
Land
—

 
$
15,907

 
$
15,686

Buildings and improvements
2-40

 
283,173

 
275,529

Machinery and equipment
3-20

 
206,871

 
176,662

Computer software
1-10

 
86,280

 
65,344

Furniture and office equipment
1-13

 
80,343

 
76,809

Construction in progress
—

 
79,402

 
51,827

 

 
751,976

 
661,857

Less: Accumulated depreciation and amortization

 
(333,044
)
 
(290,065
)
Property, plant and equipment, net

 
$
418,932

 
$
371,792



Amortization of assets acquired under capital lease obligations is included within accumulated depreciation and amortization above for the years ended December 31, 2012 and 2011, respectively. For the years ended December 31, 2012, 2011 and 2010 depreciation and amortization expense totaled $64.8 million, $57.0 million and $47.9 million, respectively. For the years ended December 31, 2012, 2011 and 2010 amortization expense related to computer software costs totaled the $8.2 million, $7.5 million and $4.6 million, respectively.
Repairs and maintenance expense was $13.7 million, $12.9 million and $11.8 million in 2012, 2011 and 2010, respectively. For the year ended December 31, 2012 and 2011, construction in progress includes amounts related to ongoing software development projects and the construction of new facilities in the United States. For the years ended December 31, 2012, 2011 and 2010, interest capitalized in connection with construction projects was not significant.