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Convertible Senior Notes (Narrative) (Details) | 1 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Aug. 31, 2014 USD ($) d $ / shares shares | Sep. 30, 2017 USD ($) d | Dec. 31, 2016 USD ($)
Debt Instrument [Line Items] |  |  |
Initial conversion rate (shares per $1,000) | 13.3251 |  |
Consecutive trading days | d |  | 50 |
Equity component of currently redeemable convertible notes (Note 3) |  | $ 21,597,000 | $ 29,563,000
Warrants issued in public offering (shares) | shares | 3,264,643 |  |
Exercise price of convertible bond hedge (USD per share) | $ / shares | $ 75.05 |  |
Payments for convertible bond hedges | $ 48,100,000 |  |
Warrant exercise price (USD per share) | $ / shares | $ 125.08 |  |
Value of warrants issued | $ 11,600,000 |  |
2019 convertible senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount outstanding |  | 245,000,000 | $ 245,000,000
Senior Notes | 2019 convertible senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Aggregate principal amount outstanding | $ 245,000,000.0 |  |
Interest rate (as a percent) | 0.75% |  |
Net proceeds from note after debt issuance costs | $ 239,300,000 |  |
Initial conversion price (in USD per share) | $ / shares | $ 75.05 |  |
If-converted value in excess of principal |  | $ 199,500,000 |
Senior Notes | 2019 convertible senior notes | Debt Instrument, Redemption, Period One |  |  |
Debt Instrument [Line Items] |  |  |
Threshold trading days | d | 20 |  |
Consecutive trading days | d | 30 |  |
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 | d | 10 |  |
Maximum threshold percentage of debt trading price trigger | 98.00% |  |

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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=84159872&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=79512289&loc=d3e4724-112606 + 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 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 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 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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