XML 65 R52.htm IDEA: XBRL DOCUMENT v3.10.0.1
Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items]          
Retainage, expected collection period (in years)     1 year    
Billings in excess of costs and earnings $ 189,302   $ 189,302   $ 194,494
Revenue recognition, BIEC, revenue recognized 25,400   125,600    
Contract liabilities 197,200   197,200   $ 206,100
Provisions for doubtful accounts 2,100 $ 400 3,500 $ 1,100  
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 $ 3,200 $ 2,100 $ 8,200 $ 4,700  
Minimum [Member]          
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items]          
Retainage, percentage of contract billings     5.00%    
Maximum [Member]          
Schedule of Accounts Receivable, Net of Allowance, and Contract Assets and Liabilities [Line Items]          
Retainage, percentage of contract billings     10.00%