Business Segment - Sales by Major Product Line (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Revenue from External Customer
Net Sales	$ 497,497	$ 513,620
Rail, Technologies, and Services
Revenue from External Customer
Net Sales	300,592	299,749
Precast Concrete Products
Revenue from External Customer
Net Sales	104,212	70,990
Steel Products and Measurement
Revenue from External Customer
Net Sales	92,693	142,881
Rail Products and Global Friction Management | Rail, Technologies, and Services
Revenue from External Customer
Net Sales	255,713	248,237
Technology Services and Solutions | Rail, Technologies, and Services
Revenue from External Customer
Net Sales	44,879	51,512
Precast Concrete Buildings | Precast Concrete Products
Revenue from External Customer
Net Sales	61,143	55,993
Other Precast Concrete Products | Precast Concrete Products
Revenue from External Customer
Net Sales	43,069	14,997
Coatings and Measurement | Steel Products and Measurement
Revenue from External Customer
Net Sales	38,329	27,833
Fabricated Steel Products | Steel Products and Measurement
Revenue from External Customer
Net Sales	$ 54,364	$ 115,048