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Equity Offerings (Details) - Distribution Agreement - USD ($) $ / shares in Units, shares in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 03, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items] |  |  |  |
Maximum aggregate offering price | $ 125,000,000.0 |  |  |
Gross proceeds from sales of common stock |  | $ 38,500,000 | $ 40,300,000 | $ 14,700,000
Issuance costs on sales of common stock |  | $ 700,000 | $ 700,000 | $ 800,000
Number of shares sold (in shares) |  | 460 | 557 | 294
Price per share sold (in dollars per share) |  | $ 83.81 | $ 72.40 | $ 49.85
Aggregate value of shares available to be offered |  | $ 31,500,000 |  |

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- Definition Sale of Stock, Available for Issuance + References No definition available. + Details
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- Definition The cash outflow for cost incurred directly with the issuance of an equity security. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3291-108585 + Details
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- Definition The number of shares issued or sold by the subsidiary or equity method investee per stock transaction. + References No definition available. + Details
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- Definition Per share amount received by subsidiary or equity investee for each share of common stock issued or sold in the stock transaction. + 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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- Details
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