Commitment and Contingencies - Performance Bond and Letter of Credit (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Jun. 29, 2019	Dec. 31, 2018
Loss Contingencies
Self-insurance workers’ compensation	$ 23,638		$ 22,312
Legal	48,561		861
Liability and other insurance	16,678		18,988
Environmental	8,186		14,552
Other	5,864		10,009
Total outstanding performance bonds and stand-by letters of credit	$ 102,927		$ 66,722
Steve and Sons
Loss Contingencies
Total outstanding performance bonds and stand-by letters of credit		$ 47,700