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DEBT (Components of Interest Expense) (Details) (USD $) | 12 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
2016 Convertible Senior Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amortization of the discount on the liability component | $ 6,463,000 | [1] | $ 5,993,000 | [1] | $ 3,740,000 | [1]
Cash interest related to the contractual interest coupon | 3,218,000 | [2] | 3,154,000 | [2] | 2,024,000 | [2]
Total | 9,681,000 |  | 9,147,000 |  | 5,764,000 |
Amortization of debt discount, capitalized interest | 1,000,000 |  | 1,100,000 |  |  |
Cash interest related to contractual interest coupon, capitalized interest | 500,000 |  | 600,000 |  |  |
2012 Senior Convertible Notes |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Amortization of the discount on the liability component | 0 | [1] | 2,527,000 | [1] | 6,850,000 | [1]
Cash interest related to the contractual interest coupon | 0 | [2] | 1,378,000 | [2] | 3,919,000 | [2]
Total | 0 |  | 3,905,000 |  | 10,769,000 |
Amortization of debt discount, capitalized interest |  |  | 500,000 |  |  |
Cash interest related to contractual interest coupon, capitalized interest |  |  | $ 300,000 |  |  |
[1] | In 2013, the amortization of the discount on the liability component of the 2016 Note is presented net of capitalized interest of $1.0 million. In 2012, the amortization of the discount on the liability component of the 2016 and 2012 Notes are presented net of capitalized interest of $1.1 million and $0.5 million, respectively.
[2] | In 2013, the cash interest related to the contractual interest coupon on the 2016 Note is presented net of capitalized interest of $0.5 million. In 2012, the cash interest related to the contractual interest coupon on the 2016 and 2012 Notes are presented net of capitalized interest of $0.6 million and $0.3 million, respectively.

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- Definition Interest Expense, Debt, Exclusing Amortization, Interest Costs Capitalized + References No definition available. + Details
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- Definition Amount of noncash expense included in interest expense to amortize debt discount and premium associated with the related debt instruments. Excludes amortization of financing costs. Alternate captions include noncash interest expense. + 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 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition Amount of the cost of borrowed funds accounted for as interest expense for debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.8) -URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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- Definition Represents the portion of interest incurred in the period on debt arrangements that was charged against earnings, excluding amortization of debt discount (premium) and financing costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 8 -Article 5 + Details
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