Cash and Cash Equivalents	6 Months Ended
	Jun. 30, 2021
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	Cash and Cash EquivalentsCash equivalents are short-term, highly liquid investments with insignificant interest rate risk and original maturities of three months or less at acquisition. At June 30, 2021, restricted and designated cash and investments totaled $16.6 million, of which $1.0 million was included in other current assets and $15.6 million was included in other non-current assets in the consolidated balance sheet. Restricted and designated cash and investments totaled $17.3 million at December 31, 2020, of which $1.1 million was included in other current assets and $16.2 million was included in other non-current assets in the consolidated balance sheet. The restricted funds represent deposits required by state agencies for self-insurance purposes and designated funds that are earmarked for a specific purpose and not for general business use.