Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2021

Accounting Policies [Abstract]

Schedule of property, plant and equipment and ranges of estimated useful service lives

Depreciation is calculated using the straight-line method over the following ranges of estimated useful service lives, in years:

	Estimated Useful Service Lives
Buildings	20 – 40
Building and leasehold improvements	6 – 20
Machinery and equipment	2 – 10
Furniture and fixtures	2 – 10

Property, plant and equipment is as follows:

	December 31,
(cost in thousands)	2021		2020
Land	$	41,425	$	42,854
Buildings	248,289		265,369
Building and leasehold improvements	137,039		150,613
Machinery and equipment	731,198		804,252
Furniture and fixtures	114,230		117,271
Assets under development	18,488		14,867
	1,290,669		1,395,226
Less accumulated depreciation	(904,080)		(931,399)
Net property, plant and equipment	$	386,589	$	463,827