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DEBT (Details) - USD ($) | Mar. 13, 2017 | Jun. 30, 2018 | Dec. 31, 2017
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Convertible Senior Notes Due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Principal Amount Denominator for Conversion into Common Stock |  | $ 1,000 |
Unsecured Debt | Convertible Senior Notes Due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Convertible senior notes, gross |  | 345,000,000 | $ 345,000,000
Deferred financing costs |  | (6,675,000) | (7,482,000)
Discount on debt |  | (55,067,000) | (61,345,000)
Total debt, net of debt discount and deferred financing costs |  | 283,258,000 | 276,173,000
Unsecured Debt | Convertible Senior Notes Due 2019 |  |  |
Debt Instrument [Line Items] |  |  |
Convertible senior notes, gross |  | 338,000 | 338,000
Deferred financing costs |  | (1,000) | (2,000)
Discount on debt |  | (7,000) | (12,000)
Total debt, net of debt discount and deferred financing costs |  | 330,000 | $ 324,000
Debt Conversion Terms Business Day Immediately Preceding October 1, 2021 [Member] | Convertible Senior Notes Due 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Conversion Obligation Common Stock Closing Sales Price Minimum as Percentage of Conversion Price | 130.00% |  |
Debt Instrument, Principal Amount Denominator for Conversion into Common Stock |  | $ 1,000 |
Debt Instrument, Conversion Obligation Common Stock Closing Sales Price Minimum, Number of Trading Days | 20 days |  |
Debt Instrument, Conversion Obligation Number of Consecutive Trading Days | 30 days |  |

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- Definition Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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