Cash and Cash Equivalents	3 Months Ended
	Mar. 31, 2020
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 March 31, 2020, restricted and designated cash and investments totaled $18.1 million, of which $1.5 million was included in other current assets and $16.6 million was included in other non-current assets in the consolidated balance sheet. Restricted and designated cash and investments totaled $19.4 million at December 31, 2019, of which $1.6 million was included in other current assets and $17.8 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.