Commitments and Contingent Liabilities - Narratives (Details) - USD ($) $ in Thousands		12 Months Ended
	Mar. 13, 2019	Dec. 31, 2019	Dec. 31, 2018
Product Liability Contingency
Accrued warranty		$ 1,222	$ 2,057
Legal fees		0	43,400
Current portion of accrued settlement (Note 18)		8,000	10,000
Accrued legal settlement, non-current		32,000	40,000
Present value or proposed remedial work		1,100,000
Undiscovered remedial work		1,700,000
Uprr
Product Liability Contingency
Purchase commitment	$ 48,000
Annual commitment amount	8,000
Uprr
Product Liability Contingency
Amounts reclassified to accrued settlement		6,600
Litigation settlement amount		40,000	50,000
Litigation settlement amount, current	2,000
Litigation settlement amount, non-current	$ 48,000
Legal fees		$ 43,400
Rail Products and Services
Product Liability Contingency
Product warranty expense			$ 611