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FAIR VALUE MEASUREMENTS (Tables) | 12 Months Ended
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Dec. 31, 2013
Fair Value Disclosures [Abstract] |
Financial Assets and Liabilities Accounted For at Fair Value on Recurring Basis | The Company’s carrying and estimated fair value of debt, at December 31, 2013 and 2012 were as follows:
|  | December 31, 2013 |  | December 31, 2012 |
|  | Carrying |  | Fair Value |  | Carrying |  | Fair Value |
|  | Value |  | Level 1 |  | Level 2 |  | Level 3 |  | Value |  | Level 1 |  | Level 2 |  | Level 3 |
Instrument |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible senior notes |  | $ | 130,628 |  | $ | - |  | $ | 197,718 |  | $ | - |  | $ | 126,918 |  | $ | - |  | $ | 165,563 |  | $ | - |
Term loan credit agreement |  |  | 229,388 |  |  | - |  |  | 236,684 |  |  | - |  |  | 290,812 |  |  | - |  |  | 300,728 |  |  | - |
Industrial revenue bond |  |  | 2,119 |  |  | - |  |  | - |  |  | 2,119 |  |  | 2,500 |  |  | - |  |  | - |  |  | 2,500 |
Capital lease obligations |  |  | 8,460 |  |  | - |  |  | - |  |  | 8,460 |  |  | 4,921 |  |  | - |  |  | - |  |  | 4,921 |
|  | $ | 370,595 |  | $ | - |  | $ | 434,402 |  | $ | 10,579 |  | $ | 425,151 |  | $ | - |  | $ | 466,291 |  | $ | 7,421 |

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- Definition Tabular disclosure of financial instruments measured at fair value, including those classified in shareholders' equity measured on a recurring or nonrecurring basis. Disclosures include, but are not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. Nonrecurring fair value measurements are those that are required or permitted in the statement of financial position in particular circumstances. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a,b,bb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2C -URI http://asc.fasb.org/extlink&oid=25499696&loc=SL7498348-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19279-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19190-110258 + Details
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