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SHARE BASED COMPENSATION - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
Weighted Average Exercise Price Per Share: |  |  |
Beginning balance, weighted average exercise price per share (in dollars per share |  | $ 19.48 |
Granted, weighted average exercise price per share (in dollars per share) |  | 18.34 |
Forfeited, weighted average exercise price per share (in dollars per share |  | 20.94 |
Ending balance, weighted average exercise price per share (in dollars per share | $ 19.10 | 19.10 | $ 19.48
Options exercisable, weighted average exercise price per share (in dollars per share) | $ 0.00 | $ 0.00 |
Weighted Average Remaining Contractual Term (in years) |  | 9 years 3 months 20 days | 9 years 11 months 19 days
Aggregate Intrinsic Value | $ (14,202) | $ (14,202) | $ 8,944
Carry Unit Awards [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employee and Non-employee Share-based Compensation Expense | 7,993 | 25,494 |
Employee Stock Option [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Employee and Non-employee Share-based Compensation Expense | $ 4,233 | $ 8,355 |
Time Vesting |  |  |
Shares Under Option (in shares): |  |  |
Outstanding balance, beginning of period (in shares) |  | 5,110,747 |
Granted (in shares) |  | 1,943,676 |
Forfeited (in shares) |  | (179,705) |
Outstanding balance, end of period (in shares) | 6,874,718 | 6,874,718 | 5,110,747
Options exercisable (in shares) | 0 | 0 |
Performance Based Vesting |  |  |
Shares Under Option (in shares): |  |  |
Outstanding balance, beginning of period (in shares) |  | 0 |
Granted (in shares) |  | 95,953 |
Forfeited (in shares) |  | (22,314) |
Outstanding balance, end of period (in shares) | 73,639 | 73,639 | 0
Options exercisable (in shares) | 0 | 0 |

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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=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under 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)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under 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)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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