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Debt - Convertible Notes Hedge Transactions, Conversion and EPS Impact (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
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Feb. 28, 2014 USD ($) | Sep. 30, 2015 USD ($) $ / shares shares | Sep. 30, 2014 shares | Dec. 31, 2013 d | Sep. 30, 2015 USD ($) $ / shares shares | Sep. 30, 2014 shares | Mar. 05, 2014 $ / shares | Dec. 16, 2013 $ / shares | Jun. 24, 2013 $ / shares | Nov. 27, 2012 $ / shares
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Reclassifications of equity to temporary equity, debt conversion |  |  |  |  | $ 6,900 |  |  |  |  |
Dilutive effect of convertible senior notes (in shares) | shares |  | 0 | 1,043 |  | 847 | 1,118 |  |  |  |
2017 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | $ 31.56 |  |  | $ 31.56 |  |  |  |  | $ 31.56
Cost of the hedge transaction(s) |  |  |  |  | $ 50,595 |  |  |  |  |
Convertible debt, threshold of stock price trigger |  |  |  | 130.00% |  |  |  |  |  |
Convertible debt, threshold trading days | d |  |  |  | 20 |  |  |  |  |  |
Convertible debt, threshold consecutive trading days |  |  |  | 30 days |  |  |  |  |  |
Convertible notes, fair value |  | $ 144,500 |  |  | $ 144,500 |  |  |  |  |
2020 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | $ 45.72 |  |  | $ 45.72 |  |  |  | $ 45.72 |
Cost of the hedge transaction(s) |  |  |  |  | $ 18,113 |  |  |  |  |
2021 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | 59.39 |  |  | $ 59.39 |  | $ 59.39 |  |  |
Cost of the hedge transaction(s) |  |  |  |  | $ 19,545 |  |  |  |  |
Hedging of Convertible Debt Instrument [Member] | 2017 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | 60.00 |  |  | $ 60.00 |  |  | $ 60.00 |  | $ 44.19
Cost of the hedge transaction(s) | $ 27,900 |  |  |  |  |  |  |  |  |
Hedging of Convertible Debt Instrument [Member] | 2020 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | 61.55 |  |  | 61.55 |  |  |  |  |
Hedging of Convertible Debt Instrument [Member] | 2021 Convertible Senior Notes [Member] |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |
Conversion price (in dollars per share) | $ / shares |  | $ 83.14 |  |  | $ 83.14 |  |  |  |  |

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- Definition Reclassifications of Permanent to Temporary Equity, Debt Conversion + References No definition available. + Details
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- Definition The price per share of the conversion feature embedded in the debt instrument. + 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 (b) -URI http://asc.fasb.org/extlink&oid=6928298&loc=SL6031898-161870 + Details
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- Definition Threshold period of specified consecutive trading days within which common stock price to conversion price of convertible debt instruments must exceed threshold percentage for a specified number of trading days to trigger conversion feature, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References No definition available. + Details
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- Definition Minimum percentage of common stock price to conversion price of convertible debt instruments to determine eligibility of conversion. + References No definition available. + Details
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- Definition Threshold number of specified trading days that common stock price to conversion price of convertible debt instruments must exceed threshold percentage within a specified consecutive trading period to trigger conversion feature. + References No definition available. + 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 The premium (cost) of a hedge, expensed during the period. + References No definition available. + Details
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- Definition Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 40 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1930-109256 + Details
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- Definition Fair value portion of notes payable. + 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 210.5-02.19,20,22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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