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Cash and Cash Equivalents
6 Months Ended
Jun. 30, 2018
Cash and Cash Equivalents [Abstract]  
Cash and Cash Equivalents Cash and Cash Equivalents

Cash 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, 2018, restricted and designated cash and investments totaled $22.9 million, of which $2.8 million was included in other current assets and $20.1 million was included in other non-current assets in the consolidated balance sheet. Restricted and designated cash and investments totaled $30.7 million at December 31, 2017, of which $7.9 million was included in other current assets and $22.8 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.