Employee Benefit Plan - Multiemployer Plan (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Multiemployer Plan [Line Items]
Total contributions	$ 130,382	$ 134,054	$ 59,287
Multiemployer Plan, Type [Extensible List]	us-gaap:OtherPensionPlansPostretirementOrSupplementalPlansDefinedBenefitMember
Multiemployer Pension Benefits
Multiemployer Plan [Line Items]
Total contributions	$ 78,060	89,703	32,389
Multiemployer Health Benefits
Multiemployer Plan [Line Items]
Total contributions	$ 52,322	$ 44,351	$ 26,898