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Components of Long Term Debt (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Debt Instrument [Line Items] |  |
Principal amount of convertible notes outstanding | $ 323,548 | $ 344,490
Less: unamortized discount | (10,596) | (19,217)
Less: current portion | (37,611) | (496)
LONG-TERM DEBT | 275,341 | 324,777
Term loan credit agreement |  |
Debt Instrument [Line Items] |  |
Principal amount of convertible notes outstanding | 191,399 | 192,845
Industrial revenue bond |  |
Debt Instrument [Line Items] |  |
Principal amount of convertible notes outstanding | 1,149 | 1,645
Convertible Senior Notes |  |
Debt Instrument [Line Items] |  |
Principal amount of convertible notes outstanding | $ 131,000 | $ 150,000

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- Definition The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28541-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=34725769&loc=d3e28878-108400 + Details
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- Definition Amount of long-term debt, after unamortized discount or premium, scheduled to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + 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 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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