Property, Plant and Equipment (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Property, plant and equipment
Land	$ 8,480	$ 10,584
Building improvements	668,089	659,676
Capitalized leases for machinery, equipment and buildings	115,652	100,530
Property, plant and equipment, gross	792,221	770,790
Accumulated depreciation and amortization	(620,303)	(579,644)
Property Plant and Equipment Net before Construction in Progress	171,918	191,146
Construction in Progress, Gross	148,049	38,993
Property, plant and equipment, net	319,967	230,139
Accumulated depreciation	$ (63,879)	$ (60,272)