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Notes Payable - Convertible (Details) (USD $) | 3 Months Ended | 9 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended |  | 0 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013 | Jan. 31, 2013 2026 Notes | Sep. 30, 2014 2026 Notes | Sep. 30, 2013 2026 Notes | Sep. 30, 2014 2026 Notes | Sep. 30, 2013 2026 Notes | Dec. 31, 2012 2026 Notes | Jul. 11, 2013 2028 Notes | Sep. 30, 2014 2028 Notes | Sep. 30, 2013 2028 Notes | Sep. 30, 2014 2028 Notes | Dec. 31, 2013 2028 Notes | Dec. 31, 2012 2028 Notes | Sep. 30, 2013 Convertible Debt 2028 Notes | Sep. 30, 2013 Convertible Debt 2028 Notes | Dec. 31, 2013 Common Stock
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding principal balance |  |  |  |  |  |  |  |  | $ 15,537,000 |  |  |  |  |  | $ 223,035,000 |  |  |
Stated interest rate |  |  |  |  | 3.95% |  | 3.95% |  |  |  | 5.125% |  | 5.125% |  |  |  |  |
Repayments of convertible debt |  | 0 | 246,797,000 | 20,702,000 |  |  |  |  |  |  |  |  |  | 226,427,000 |  |  |  |
Settled |  |  |  | 15,537,000 |  |  |  |  |  | 130,000 |  | 222,905,000 |  | 223,035,000 |  |  |  |
Decrease to APIC, conversion of debt |  |  |  | 5,028,000 |  |  |  |  |  |  |  |  |  | 3,197,000 |  |  |  |
Conversion period based on average daily closing price |  |  |  |  |  |  |  |  |  |  |  |  |  | 20 days |  |  |  |
Shares of common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,407,911
Noncash interest charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,000 | 5,400,000 |
Contractual interest expense |  | 924,000 | 2,888,000 |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 2,072,000 |
Amortization of debt costs |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 | 566,000 |
Total interest expense | $ 26,000 |  | $ 8,038,000 | $ 137,000 | $ 0 | $ 0 | $ 0 | $ 0 |  |  | $ 0 |  | $ 0 | $ 195,000 |  |  |  |

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- Definition Adjustment to additional paid in capital resulting from the recognition of convertible debt instruments as two separate components - a debt component and an equity component. This bifurcation may result in a basis difference associated with the liability component that represents a temporary difference for purposes of applying accounting for income taxes. The initial recognition of deferred taxes for the tax effect of that temporary difference is as an adjustment to additional paid in capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 22 -URI http://asc.fasb.org/extlink&oid=26072319&loc=SL6014347-161799 + 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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