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Basis of Presentation and Summary of Significant Accounting Policies - Anti-dilutive Securities (Details) - shares shares in Thousands | 3 Months Ended | 9 Months Ended |
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Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Jun. 30, 2009
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable |  |  |  |  |
Net dilutive potential common shares issuable | 675 | 326 | 730 | 9,901 |
4.25% convertible senior notes due June 2014 |  |  |  |  |
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable |  |  |  |  |
Interest rate (as a percent) |  |  |  |  | 4.25%
On exercise of options where exercise price is greater than average market value for the period |  |  |  |  |
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable |  |  |  |  |
Net dilutive potential common shares issuable | 503 | 326 | 482 | 470 |
On exercise of options and vesting of restricted stock units |  |  |  |  |
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable |  |  |  |  |
Net dilutive potential common shares issuable | 172 | 0 | 248 | 0 |
On exercise of warrants |  |  |  |  |
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable |  |  |  |  |
Net dilutive potential common shares issuable |  | 0 | 0 | 0 |
On conversion of 4.25% convertible senior notes due 2014 |  |  |  |  |
Anti-dilutive effect of the calculation of net dilutive potential shares of common stock issuable |  |  |  |  |
Net dilutive potential common shares issuable |  |  |  | 9,431 |

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- Definition Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Antidilution -URI http://asc.fasb.org/extlink&oid=6505113 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Diluted Earnings Per Share -URI http://asc.fasb.org/extlink&oid=6510752 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Contingent Stock Agreement -URI http://asc.fasb.org/extlink&oid=6508534 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + 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)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 + Details
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