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EMPLOYEE STOCK COMPENSATION - Summary of SARs Activity (Details) - Stock appreciation rights - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Jun. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016
Number of Shares |  |  |  |
Outstanding at beginning of period (in shares) | 1,559,012 |  | 1,559,047 |
Forfeited (in shares) |  |  | (35) |
Outstanding at end of period (in shares) | 1,559,012 | 1,559,012 | 1,559,012 | 1,559,047
Exercisable at end of period (in shares) | 1,559,012 |  | 1,559,012 |
Weighted-Average Exercise Price Per Share |  |  |  |
Outstanding at beginning of period (in dollars per share) | $ 11.60 |  | $ 11.60 |
Forfeited (in dollars per share) |  |  | 10.09 |
Outstanding at end of period (in dollars per share) | 11.60 | $ 11.60 | 11.60 | $ 11.60
Exercisable at end of period (in dollars per share) | $ 11.60 |  | $ 11.60 |
Weighted-Average Remaining Contract Term |  |  |  |
Outstanding | 4 years 10 months 23 days | 5 years 1 month 22 days | 4 years 10 months 23 days | 5 years 7 months 21 days
Forfeited |  |  | 4 years 10 months 23 days |
Exercisable at end of period | 4 years 10 months 23 days |  | 4 years 10 months 23 days |
Aggregated Intrinsic Value |  |  |  |
Outstanding | $ 14,261 | $ 15,430 | $ 14,261 | $ 8,961
Exercisable at end of period | $ 14,261 |  | $ 14,261 |
Number of Shares |  |  |  |
Outstanding at beginning of period (in shares) | 0 |  | 8,069 |
Vested (in shares) | 0 |  | (8,034) |
Forfeited (in shares) | 0 |  | (35) |
Outstanding at end of period (in shares) | 0 | 0 | 0 | 8,069
Weighted Average Grant Date Fair Value Per Share |  |  |  |
Outstanding at beginning of period (in dollars per share) | $ 0.00 |  | $ 10.09 |
Vested (in dollars per share) | 0.00 |  | 10.09 |
Forfeited (in dollars per share) | 0.00 |  | 10.09 |
Outstanding at end of period (in dollars per share) | $ 0.00 | $ 0.00 | $ 0.00 | $ 10.09

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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://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 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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&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://www.xbrl.org/2003/role/presentationRef -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=96867065&loc=d3e5070-113901 + Details
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