Contingent liabilities and commitments	6 Months Ended
	Jun. 30, 2021
Commitments and Contingencies Disclosure [Abstract]
Contingent liabilities and commitments	Contingent liabilities and commitments. In the ordinary course of business, the Company guarantees the third-party indebtedness of certain of its consolidated subsidiaries. As of June 30, 2021, the maximum potential future payments on the guarantees are not more than the related notes payable recorded in the condensed consolidated balance sheets. The Company also guarantees the indebtedness related to lease obligations of certain of its consolidated subsidiaries. The maximum future obligations arising from these lease-related guarantees are not more than the Company’s future lease obligations, as presented on the condensed consolidated balance sheets, plus lease operating expenses. As of June 30, 2021, the Company also had unused letters of credit aggregating $4.9 million related to workers’ compensation and other insurance. The Company does not expect to make any payments on these guarantees.