Receivables, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Receivables	$ 431,604	$ 341,186	$ 362,700
Allowance for Accounts, Notes, Loans and Financing Receivable, Current	477	364	364
Receivables, net	431,127	340,822	362,336
Back charges claims	10,500	6,500	0
Construction Contracts [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Receivables	362,100	298,426	307,816
Completed and in Progress [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Receivables	266,685	206,756	229,861
Retentions [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Receivables	95,415	91,670	77,955
Escrow [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Receivables	19,804	21,958	22,381
Non Escrow [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Receivables	75,611	69,712	55,574
Construction Material Sales [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Receivables	54,277	28,727	49,064
Other Business Products and Services [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total Gross Receivables	15,227	14,033	5,820
customer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Affirmative Claim Recovery Estimate	$ 8,100	$ 8,800	$ 7,900