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Financing Arrangements (Details Textual) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Aug. 31, 2014 USD ($) d $ / shares shares | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Debt Instrument [Line Items] |  |  |  |
Convertible debt, noncurrent |  | $ 0 |  |
Equity component of convertible debt issuance, net of issuance costs |  | (39,628,000) | $ 51,271,000 |
Unamortized debt issuance costs |  | 0 | 3,388,000 |
Carrying value of equity component |  | 39,628,000 |  |
Warrants to purchase number of shares | shares | 3,264,643 |  |  |
Exercise price per share of convertible bond hedges | $ / shares | $ 75.05 |  |  |
Payments for Convertible Bond Hedges |  | 0 | 48,143,000 | $ 0
Exercise price per share of warrants | $ / shares | $ 125.08 |  |  |
Sale of warrants | $ 11,600,000 |  | 11,638,000 |
Current portion of notes payable ($334 and $0 related to a VIE, respectively |  | 201,985,000 | 334,000 |
2019 Convertible Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Principal amount outstanding |  | 245,000,000 | 245,000,000 |
Convertible Notes Payable |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Current portion of notes payable ($334 and $0 related to a VIE, respectively |  | $ 0 | $ 334,000 |
Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Payments for Convertible Bond Hedges | $ 48,100,000 |  |  |
Senior Notes | 2019 Convertible Senior Notes |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest on debt instrument (percent) | 0.75% |  |  |
Principal amount outstanding | $ 245,000,000.0 |  |  |
Convertible debt conversion ratio | 0.0133251 |  |  |
Net proceeds from debt issuance | $ 239,300,000 |  |  |
Debt conversion price per share | $ / shares | $ 75.05 |  |  |
Stock price trigger threshold (percent) |  | 130.00% |  |
Proceeds from issuance of debt | $ 245,000,000 |  |  |
If-converted value of debt in excess of principal |  | $ 108,900,000 |  |
Discount rate (percent) | 5.83% |  |  |
Convertible debt, noncurrent | $ 192,500,000 |  |  |
Debt issuance cost | 5,700,000 |  |  |
Equity component of convertible debt issuance, net of issuance costs | 1,200,000 |  |  |
Unamortized debt issuance costs | $ 4,500,000 |  |  |
Term of debt (duration) | 5 years |  |  |
Carrying value of equity component |  | $ 51,300,000 |  |
Senior Notes | 2019 Convertible Senior Notes | Debt Instrument, Redemption, Period One |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of trading days | d | 20 |  |  |
Number of consecutive trading days | 30 days |  |  |
Stock price trigger threshold (percent) | 130.00% |  |  |
Senior Notes | 2019 Convertible Senior Notes | Debt Instrument, Redemption, Period Two |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Number of trading days | d | 5 |  |  |
Number of consecutive trading days | 10 days |  |  |
Debt threshold trigger price (percent) | 98.00% |  |  |

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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=51819886&loc=SL6014347-161799 + Details
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- Definition Amount of increase in additional paid in capital (APIC) resulting from the issuance of warrants. Includes allocation of proceeds of debt securities issued with detachable stock purchase warrants. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 25 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28183637&loc=d3e4724-112606 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Warrant -URI http://asc.fasb.org/extlink&oid=6528364 + Details
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- Definition Carrying amount of long-term convertible debt as of the balance sheet date, net of the amount due in the next twelve months or greater than the normal operating cycle, if longer. The debt is convertible into another form of financial instrument, typically the entity's common stock. + 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + 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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