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Convertible Notes (Details 2) (Convertible Senior Notes [Member], USD $) In Thousands, unless otherwise specified | Mar. 31, 2014 | Dec. 31, 2013
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Debt Instrument [Line Items] |  |
Principal amount of convertible notes | $ 310,500 | $ 310,500
1.125% Convertible Senior Notes due 2018 |  |
Debt Instrument [Line Items] |  |
Principal amount of convertible notes | $ 138,000 | $ 138,000
Convertible notes stated interest rate (as a percent) | 1.125% | 1.125%

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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 SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 22 -Article 5 Reference 2: 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 + Details
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