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Financing Arrangements (Narrative) (Details) | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Aug. 31, 2014 USD ($) d $ / shares shares | Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Debt Instrument [Line Items] |  |  |
Initial debt value |  | $ 0 | $ 0
Equity component of currently redeemable convertible notes (Note 5) |  | 32,138,000 | 39,628,000
Common stock, shares available to be issued | shares | 3,264,643 |  |
Exercise price of convertible bond hedge | $ / shares | $ 75.05 |  |
Exercise price (USD per share) | $ / shares | $ 125.08 |  |
Proceeds from issuance of warrants | $ 11,600,000 |  |
2019 convertible senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount outstanding |  | 245,000,000 | $ 245,000,000
Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Payment for convertible bond hedges | $ 48,100,000 |  |
Senior Notes | 2019 convertible senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate | 0.75% |  |
Aggregate principal amount outstanding | $ 245,000,000.0 |  |
Net proceeds from note after debt issuance costs | $ 239,300,000 |  |
Initial conversion rate | 0.0133251 |  |
Initial conversion price | $ / shares | $ 75.05 |  |
Percentage of stock price trigger to classify convertible debt as current |  |  | 130.00%
Proceeds from issuance of debt | $ 245,000,000 |  |
Debt discount rate | 5.83% |  |
Initial debt value | $ 192,500,000 |  |
If-converted value in excess of principal |  | 88,200,000 |
Debt issuance costs | 5,700,000 |  |
Equity component of convertible notes recorded as a reduction to additional paid-in capital | 1,200,000 |  |
Long-term debt issuance costs | $ 4,500,000 |  |
Term of notes | 5 years |  |
Equity component of currently redeemable convertible notes (Note 5) |  | $ 51,300,000 | $ 51,300,000
Senior Notes | 2019 convertible senior notes | Debt Instrument, Redemption, Period One |  |  |
Debt Instrument [Line Items] |  |  |
Threshold trading days | d | 20 |  |
Consecutive trading days | 30 days |  |
Percentage of stock price trigger to classify convertible debt as current | 130.00% | 130.00% |
Senior Notes | 2019 convertible senior notes | Debt Instrument, Redemption, Period Two |  |  |
Debt Instrument [Line Items] |  |  |
Threshold trading days | d | 5 |  |
Consecutive trading days | 10 days |  |
Maximum threshold percentage of debt trading price trigger | 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 Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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 The amount by which the convertible debt's if-converted value exceeds its principle amount at the balance sheet date, regardless of whether the instrument is currently convertible. This element applies to public companies only. + 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 (c) -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 Face (par) amount of debt instrument at time of issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=64930739&loc=d3e28878-108400 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64930785&loc=d3e28551-108399 + Details
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- Definition Period of time between issuance and maturity of debt instrument, 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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