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Stock Incentive Plan - Stock Award Activity (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Additional option disclosures |  |  |  |
Total future stock compensation expense related to nonvested awards | $ 16.8 |  |  |
Weighted average period of recognition of future stock compensation expense | 4 years |  |  |
Employee Consultants and Directors Stock Options [Member] |  |  |  |
Stock option activity |  |  |  |
Options, Outstanding at the beginning of the period (in shares) | 4,340,997 | 3,228,027 | 2,743,818 |
Options, Granted (in shares) | 1,298,355 | 1,529,850 | 946,250 |
Options, Forfeited (in shares) | (94,777) | (75,938) | (290,478) |
Options, Exercised (in shares) | (568,135) | (340,942) | (171,563) |
Options, Outstanding at the end of the period (in shares) | 4,976,440 | 4,340,997 | 3,228,027 | 2,743,818
Options, Exercisable (in shares) | 2,343,796 |  |  |
Weighted Average Exercise Price, Outstanding at the beginning of the period (in dollars per share) | $ 4.92 | $ 3.40 | $ 3.03 |
Weighted Average Exercise Price, Granted (in dollars per share) | 19.99 | 7.67 | 4.31 |
Weighted Average Exercise Price, Forfeited (in dollars per share) | (6.29) | (3.74) | (3.12) |
Weighted Average Exercise Price, Exercised (in dollars per share) | (3.43) | (3.16) | (2.99) |
Weighted Average Exercise Price, Outstanding at the end of the period (in dollars per share) | 8.99 | $ 4.92 | $ 3.40 | $ 3.03
Weighted Average Exercise Price, Exercisable (in dollars per share) | $ 4.12 |  |  |
Weighted Average Remaining Contractual Term, Outstanding | 6 years 4 months 21 days | 5 years 11 months 5 days | 5 years 5 months 5 days | 5 years 11 months 9 days
Weighted Average Remaining Contractual Term, Exercisable | 4 years 3 months 4 days |  |  |
Additional option disclosures |  |  |  |
Average fair value of options granted | $ 19.99 | $ 7.67 | $ 4.31 |
Intrinsic value of options exercised | $ 7.8 | $ 1.5 |  |
Intrinsic value of options outstanding | 96.1 | 17.7 |  |
Intrinsic value of options exercisable | $ 56.7 | $ 12.9 |  |
Stock Options |  |  |  |
Additional option disclosures |  |  |  |
Average fair value of options granted | $ 8.40 | $ 3.84 |  |

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- Definition Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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