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INCOME TAXES - Valuation allowance (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Valuation allowance - beginning of year | $ 41,100 | $ 40,331
Valuation allowance - end of year | 16,157 | 41,100
Operating loss carryforwards |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Change in valuation allowance | (27,116) | 3,857
Foreign tax credit |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Change in valuation allowance | 267 | (2,775)
Australian CTA and accruals and other foreign rate differentials |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Change in valuation allowance | 1,006 | (313)
Change in investment-related items |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Change in valuation allowance | 900 | $ 0
Items unrelated to Australian operations |  |
Movement in Valuation Allowances and Reserves [Roll Forward] |  |
Change in valuation allowance | $ (1,200) |

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of increase (decrease) in the valuation allowance for a specified deferred tax asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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