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2.25% Convertible Senior Notes Due 2019 (Carrying Amounts of Liability and Equity Components - Additional Information) (Details) - 2.25% Convertible Senior Notes Due 2019 [Member] - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Mar. 31, 2016 | Dec. 31, 2015 | Jun. 30, 2014
Debt Instrument [Line Items] |  |  |
Debt instrument, interest rate | 2.25% |  | 2.25%
Transaction costs related to the equity component | $ 1,177 | $ 1,177 |
Remaining period over which the unamortized debt discount will be amortized | 3 years 3 months |  |

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- Definition Remaining amortization period for discount on the liability component of convertible debt which may be settled in cash upon conversion, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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