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Equity Compensation Plans - Stock Award Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Employee Consultants and Directors Stock Options [Member] |  |  |
Time-Based Stock Options |  |  |
Options, Outstanding at the beginning of the period (in shares) | 3,893,171 | 4,304,201 |
Options, Granted (in shares) | 344,176 | 656,250 |
Options, Forfeited (in shares) | (287,609) | (40,473) |
Options, Exercised (in shares) | (529,557) | (1,026,807) |
Options, Outstanding at the end of the period (in shares) | 3,420,181 | 3,893,171 | 4,304,201
Options, Vested and expected to vest | 3,420,181 |  |
Options, Exercisable (in shares) | 2,099,616 |  |
Weighted Average Exercise Price, Outstanding at the beginning of the period (in dollars per share) | $ 11.94 | $ 7.28 |
Weighted Average Exercise Price, Granted (in dollars per share) | 18.07 | 29.48 |
Weighted Average Exercise Price, Forfeited (in dollars per share) | 22.75 | 9.56 |
Weighted Average Exercise Price, Exercised (in dollars per share) | 5.21 | 3.72 |
Weighted Average Exercise Price, Outstanding at the end of the period (in dollars per share) | 12.69 | $ 11.94 | $ 7.28
Weighted Average Exercise Price, Vested and expected to vest | 12.69 |  |
Weighted Average Exercise Price, Exercisable (in dollars per share) | $ 7.90 |  |
Weighted Average Remaining Contractual Term, Outstanding | 5 years 8 months 12 days | 5 years 11 months 12 days | 5 years 4 months 20 days
Weighted Average Remaining Contractual Term, Vested and expected to vest | 5 years 8 months 4 days |  |
Weighted Average Remaining Contractual Term, Exercisable | 4 years 1 month 6 days |  |
Aggregate Intrinsic Value, Outstanding | $ 26,074 | $ 41,020 | $ 90,473
Aggregate Intrinsic Value, Vested and expected to vest | 26,074 |  |
Aggregate Intrinsic Value, Exercisable | $ 22,712 |  |
Restricted and Performance Stock Units [Member] |  |  |
Restricted and Performance Stock Units |  |  |
Outstanding, Beginning Balance | 1,106,363 | 610,730 |
Granted | 217,146 | 516,433 |
Released | (86,405) | (7,150) |
Forfeited | (123,407) | (13,650) |
Outstanding, Ending Balance | 1,113,697 | 1,106,363 | 610,730
Outstanding, Weighted Average Grant Date Fair Value, Beginning Balance | $ 22.18 | $ 21.14 |
Granted, Grant Date Fair Value (per share) | 17.60 | 23.34 | $ 26.24
Released, Grant Date Fair Value (per share) | 16.77 | 8.95 |
Forfeited, Grant Date Fair Value (per share) | 22.97 | 25.89 |
Outstanding, Weighted Average Grant Date Fair Value, Ending Balance | $ 21.62 | $ 22.18 | $ 21.14

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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(3) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value as of grant date pertaining to an equity-based award plan other than a stock (or unit) option plan for which the grantee gained the right during the reporting period, by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash in accordance with the terms of the arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(2) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901 + Details
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