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Cash, Cash Equivalents And Restricted Cash (Reconciliation Of Cash, Cash Equivalents And Restricted Cash) (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Cash and cash equivalents $ 174,340 $ 192,868    
Restricted cash 4,090 4,780    
Total cash, cash equivalents and restricted cash 178,430 197,648 $ 164,975 $ 196,607
Tutor Perini Corporation [Member]        
Cash and cash equivalents 75,423 94,713    
Joint Venture [Member]        
Cash and cash equivalents $ 98,917 $ 98,155