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Stockholders' Equity - Registration Rights Agreement (Details) - USD ($) $ in Millions |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 11, 2019 | Dec. 31, 2018 | Dec. 31, 2016 | Jun. 30, 2016
Debt Instrument [Line Items] |  |  |  |
Maximum amount of repurchase rights agreement |  | $ 50 |  |
Effectiveness penalty percentage |  | 0.25% |  |
Purchase price allocation percentage |  | 0.75% |  |
5% Convertible Senior Notes due 2021 |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt instrument, interest rate |  | 5.00% |  | 5.00%
5% Convertible Senior Notes due 2021 | Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Interest rate on the 90th day following registration statement |  | 0.25% |  |
Interest rate on the 91st day following the registration statement |  | 0.50% |  |
Registration statement liquidation damages limit |  | 0.50% |  |
Debt instrument, interest rate |  | 5.00% | 5.00% |
2.5% Convertible Senior Note | Convertible Debt |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Registration statement liquidation damages limit |  | 5.00% |  |
Debt instrument, interest rate |  | 2.50% |  |
Liquidation damages percent |  | 1.00% |  |
Subsequent Event | Washington Refinery Acquisition |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Issuance of common stock in connection with acquisition (in shares) | 2,363,776 |  |  |

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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 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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