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REVENUE, CONTRACT ASSETS AND LIABILITIES AND OTHER CONTRACT MATTERS - Contract Assets and Liabilities (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 USD ($) vessel | Jun. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) vessel | Jun. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) vessel | Mar. 31, 2018 vessel
Revenue from Contract with Customer [Abstract] |  |  |  |  |  |
Contract assets | $ 51,334 |  | $ 51,334 |  | $ 29,982 |
Contract liabilities | (13,823) |  | (13,823) |  | (16,845) |
Contracts in progress, net | $ 37,511 |  | $ 37,511 |  | $ 13,137 |
Number of multi-purpose service vessels | vessel | 2 |  | 2 |  | 2 | 2
Contract with customer, liability, revenue recognized | $ 7,600 | $ 4,100 | $ 13,900 | $ 4,900 |  |
Contract with customer, liability, accrued contract losses, current | $ 2,000 |  | $ 2,000 |  | $ 2,400 |

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- Definition Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118944033&loc=SL49130533-203044 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 8 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045 + Details
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