Property, Plant and Equipment (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
Property, plant and equipment
Land		$ 8,242	$ 8,480
Buildings and Improvements, Gross		652,783	668,089
Finance Lease, Right-of-Use Asset, before Accumulated Amortization		148,174	115,652
Property, Plant and Equipment, Gross		809,199	792,221
Accumulated depreciation and amortization	[1]	(652,898)	(620,303)
Property Plant and Equipment Net before Construction in Progress		156,301	171,918
Construction in Progress, Gross		236,019	148,049
Property, plant and equipment, net		392,320	319,967
Accumulated depreciation		$ (80,336)	$ (63,879)

[1] Includes $80.3 million and $63.9 million of accumulated amortization related to assets under finance leases at December 31, 2022 and December 31, 2021, respectively.