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Cash and Cash Equivalents
6 Months Ended
Jun. 30, 2018
Disclosure Text Block [Abstract]  
Cash and Cash Equivalents
4.
Cash and Cash Equivalents
 
The Company considers all highly liquid investments with original or remaining maturities of three months or less at the time of purchase to be cash equivalents. Cash and cash equivalents include cash balances held by our consolidated subsidiaries and our majority controlled construction joint ventures. At June 30, 2018 and December 31, 2017, cash and cash equivalents included $17.6 million and $31.1 million, respectively, belonging to our consolidated 50% owned subsidiaries. At June 30, 2018 and December 31, 2017, cash and cash equivalents included $12.3 million and $18.9 million, respectively, belonging to our construction joint ventures. Construction joint venture cash balances are limited to joint venture activities and are not available for other projects, general cash needs or distribution to us without approval of the board of directors, or equivalent body, of the respective joint ventures.
 Restricted cash of approximately $3.6 million is included in “Other current assets” on the condensed consolidated balance sheets as of June 30, 2018 and December 31, 2017 and represents $3.0 million of cash designated as collateral for a standby letter of credit and approximately $0.6 million represents cash deposited by a customer, for the benefit of the Company, in an escrow account which is restricted until the customer releases the restriction upon the completion of the job. 
 The Company holds cash on deposit in U.S. banks, at times, in excess of federally insured limits. Management does not believe that the risk associated with keeping cash deposits in excess of federal deposit insurance limits represents a material risk.