Pension Plans (Details) - Multi-employer defined benefit pension plan - Consenting agreement entered with local bargaining union - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2024	Mar. 31, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Pension Plans
Insolvent period	20 years
Estimated liability upon withdrawal from plan				$ 96,000	$ 104,300	$ 99,300
Percentage of annual compounded surcharge for rehabilitation	5.00%
Pension expense	$ 704	$ 865	$ 3,516	3,510
Surcharges	$ 248	$ 305	$ 1,239	$ 1,237