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DEBT - 1.00 CONVERTIBLE NOTES (Details) |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Jul. 17, 2013 USD ($) | Jun. 18, 2013 USD ($) label $ / shares | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Mar. 31, 2017 USD ($) | Jul. 12, 2013 USD ($)
Convertible Notes |  |  |  |  |  |  |  |
Interest and other, net |  |  | $ 3,374,000 | $ (3,715,000) | $ (2,403,000) | $ (15,298,000) |  |
1.00% Convertible Notes due 2018 |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |
Interest rate |  |  | 1.00% |  | 1.00% |  |  |
Estimated fair value of convertible notes |  |  | $ 72,227,000 |  | $ 72,227,000 |  |  |
Convertible Debt | 1.00% Convertible Notes due 2018 |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |
Principal amount at issuance |  | $ 250,000,000 |  |  |  |  |  |
Interest rate |  | 1.00% |  |  |  |  |  |
Percentage of par value at which debt was issued |  | 98.50% |  |  |  |  |  |
Proceeds from issuance of debt | $ 283,188,000 | $ 246,250,000 |  |  |  |  |  |
Period of overallotment option to purchase additional amount of debt granted to underwriters |  | 30 days |  |  |  |  |  |
Amount pertaining to exercise of over-allotment of debt by underwriters | $ 37,500,000 |  |  |  |  |  |  |
Initial conversion rate of common stock per $1000 of principal amount of Convertible Notes (in shares) |  | 46.4727 |  |  |  |  |  |
Principal amount used for debt instrument conversion ratio |  | $ 1,000 |  |  |  |  |  |
Initial conversion price of convertible notes into common stock (in dollars per share) | $ / shares |  | $ 21.52 |  |  |  |  |  |
Number of shares to be converted into common stock | label |  | 13,361,000 |  |  |  |  |  |
Converted instrument amount |  |  | 40,088,000 |  | 253,986,000 |  |  |
Interest and other, net |  |  | 700,000 |  | 4,900,000 |  |  |
Estimated fair value of convertible notes |  |  |  |  |  |  |  | $ 225,567,000
Non-convertible borrowing rate | 6.15% |  |  |  |  |  |  |
Carrying amount of the equity component of convertible notes |  |  |  |  |  |  |  | 57,621,000
Banking, legal and accounting fees related to issuance of convertible notes |  |  |  |  |  |  |  | $ 2,815,000
Banking, legal and accounting fees related to issuance of convertible notes allocated to the liability component | $ 2,209,000 |  |  |  |  |  |  |
Banking, legal and accounting fees related to issuance of convertible notes allocated to the equity component | $ 606,000 |  |  |  |  |  |  |
Principal amount of Convertible Notes |  |  | 14,163,000 |  | 14,163,000 |  | $ 268,149,000 |
The value by which Convertible Notes exceed the principal value |  |  |  |  | $ 58,064,000 |  | $ 470,456,000 |
Convertible Debt | 1.00% Convertible Notes due 2018 | Maximum |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |
Additional amount of debt for purchase of which overallotment option is granted to underwriters |  | $ 37,500,000 |  |  |  |  |  |
Convertible Debt | 1.00% Convertible Notes due 2018 | Conversion Terms at Holder's Option |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |
Principal amount used for debt instrument conversion ratio |  | $ 1,000 |  |  |  |  |  |
Target ratio of closing share price to conversion price as a condition for conversion or redemption of Convertible Notes (as a percent) |  | 130.00% |  |  |  |  |  |
Ratio of closing share price to conversion price as a condition for conversion of Convertible Notes (as a percent) |  | 98.00% |  |  |  |  |  |
Convertible Debt | 1.00% Convertible Notes due 2018 | Conversion Terms at Holder's Option | Minimum |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |
Number of trading days triggering conversion of redemption feature |  | 20 days |  |  |  |  |  |
Number of trading days in the measurement period that the entity's common stock closing price to conversion price must exceed a specified percentage of conversion price to trigger conversion feature of notes | label |  | 5 |  |  |  |  |  |
Convertible Debt | 1.00% Convertible Notes due 2018 | Conversion Terms at Holder's Option | Maximum |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |
Number of trading days triggering conversion of redemption feature |  | 30 days |  |  |  |  |  |
Number of trading days in the measurement period that the entity's common stock closing price to conversion price must exceed a specified percentage of conversion price to trigger conversion feature of notes | label |  | 10 |  |  |  |  |  |
Convertible Debt | 1.00% Convertible Notes due 2018 | Conversion Terms upon Occurrence of Certain Fundamental Company Changes |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |
Percentage of principal amount for computation of redemption price |  | 100.00% |  |  |  |  |  |
Convertible Debt | 1.00% Convertible Notes due 2018 | Conversion Terms, Event of Default |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |
Minimum percentage of aggregate principal amount held by bondholders to declare notes due and payable |  | 25.00% |  |  |  |  |  |
In event of default arising out of certain bankruptcy events, the percentage of principal amount due and payable |  | 100.00% |  |  |  |  |  |
Convertible Debt | October 2017 Settlement Dates |  |  |  |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |
Converted instrument amount |  |  | $ 2,000 |  |  |  |  |

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- Definition In the event of default, the minimum percentage of aggregate principal of notes held by a class of bondholders qualifying eligibility to declare principal of and accrued and unpaid interest due and payable. + References No definition available. + Details
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- Definition Represents the percentage of principal amount used in computation of the redemption price to be paid on conversion of convertible notes. + References No definition available. + Details
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- Definition For an unclassified balance sheet, the amount as of the balance sheet date of capitalized costs associated with the issuance of debt instruments (for example, legal, accounting, underwriting, printing, and registration costs) that will be charged against earnings over the life of the debt instruments to which such costs pertain which is allocated to liability component. + References No definition available. + Details
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- Definition Fair value portion of borrowing which can be exchanged for a specified number of another security at the option of the issuer or the holder, for example, but not limited to, the entity's common stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Convertible Security -URI http://asc.fasb.org/extlink&oid=6509036 + Details
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- Definition The value of the financial instrument(s) that the original debt is being converted into in a noncash (or part noncash) transaction. "Part noncash" refers to that portion of the transaction not resulting in cash receipts or cash payments in the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 + Details
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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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- Definition The price per share of the conversion feature embedded in the debt instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Ratio applied to the conversion of debt instrument into equity with equity shares divided by debt principal amount. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Conversion Rate -URI http://asc.fasb.org/extlink&oid=6509012 Reference 3: 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(a)(5)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
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- Definition The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition The number of equity instruments that the holder of the debt instrument would receive if the debt was converted to equity. + 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(a)(5)) -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 505 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21521-112644 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28555-108399 + Details
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