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Property, plant and equipment
 12 Months Ended
Dec. 31, 2019
Property, Plant and Equipment [Abstract]  
Property, plant and equipment Property, plant and equipment
The major classes of property, plant and equipment, at cost, at December 31, 2019 and 2018 were as follows: 
20192018
(Dollars in thousands)
Land, buildings and leasehold improvements
$248,067  $224,605  
Machinery and equipment443,612  421,873  
Computer equipment and software158,574  137,899  
Construction in progress63,991  105,319  
914,244  889,696  
Less: Accumulated depreciation(483,525) (456,930) 
Property, plant and equipment, net$430,719  $432,766  

Supplemental cash flow information
Year Ended December 31,
201920182017
(Dollars in thousands)
Non cash investing and financing activities of continuing operations:
Property, plant and equipment additions due to build-to-suit lease transactions$—  $29,448  $—