Quarterly report pursuant to Section 13 or 15(d)

REVENUE, CONTRACT ASSETS AND LIABILITIES AND OTHER CONTRACT MATTERS - Contract Assets and Liabilities (Details)

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REVENUE, CONTRACT ASSETS AND LIABILITIES AND OTHER CONTRACT MATTERS - Contract Assets and Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Revenue from Contract with Customer [Abstract]          
Contract assets $ 50,855   $ 50,855   $ 29,982
Contract liabilities (15,682)   (15,682)   (16,845)
Contracts in progress, net 35,173   35,173   13,137
Contract with customer, liability, revenue recognized 8,500 $ 2,600 14,300 $ 5,100  
Contract with customer, liability, accrued contract losses, current $ 3,000   $ 3,000   $ 2,400