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Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items]          
Billings in excess of costs and earnings $ 243,224   $ 243,224   $ 194,494
Revenue recognition, BIEC, revenue recognized 15,000   99,800    
Contract liabilities 251,100   251,100   $ 206,100
Provisions for doubtful accounts 500 $ 200 $ 1,400 $ 700  
Retainage, expected collection period (in years)     1 year    
Interest Expense [Member] | Accounts Receivable Financing Arrangements [Member]          
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items]          
Non-recourse financing arrangements, discount charge $ 3,100 $ 1,700 $ 5,000 $ 2,600  
Minimum [Member]          
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items]          
Retainage, percent of contract billings     5.00%    
Maximum [Member]          
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items]          
Retainage, percent of contract billings     10.00%