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Cash and Cash Equivalents	12 Months Ended
	Dec. 31, 2017
Cash and Cash Equivalents [Abstract]
Cash and Cash Equivalents	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 December 31, 2017 and December 31, 2016, cash and cash equivalents included $31.1 million and $24.1 million, respectively, of our consolidated 50% owned subsidiaries. At December 31, 2017 and December 31, 2016, cash and cash equivalents included $18.9 million and $10.9 million, respectively, of 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 $3.0 million is included in "Other current assets, net" and “Other assets, net” on the consolidated balance sheet as of December 31, 2017 and December 31, 2016, respectively. This amount represents cash deposited by the Company into a separate account and designated as collateral for a standby letter of credit in the same amount in accordance with contractual agreements. Refer to Notes 9 and 11 for more information about our standby letter of credit. In addition, restricted cash of approximately $0.6 million and $2.0 million, is included in “Other current assets” on the consolidated balance sheet as of December 31, 2017 and December 31, 2016 respectively and 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.

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- Definition

The entire disclosure for cash and cash equivalent footnotes, which may include the types of deposits and money market instruments, applicable carrying amounts, restricted amounts and compensating balance arrangements. Cash and equivalents include: (1) currency on hand (2) demand deposits with banks or financial institutions (3) other kinds of accounts that have the general characteristics of demand deposits (4) short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Generally, only investments maturing within three months from the date of acquisition qualify.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 305
-URI http://asc.fasb.org/topic&trid=2122426

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