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EMPLOYEE STOCK COMPENSATION - Summary of SARs Activity (Details) - Stock appreciation rights - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2017 | Dec. 31, 2016
Number of Shares |  |
Outstanding at beginning of period (in shares) | 1,559,047 |
Forfeited (in shares) | (35) |
Outstanding at end of period (in shares) | 1,559,012 | 1,559,047
Exercisable at end of period (in shares) | 1,559,012 |
Weighted- Average Exercise Price per Share |  |
Outstanding at beginning of period (in dollars per share) | $ 11.60 |
Forfeited (in dollars per share) | 10.09 |
Outstanding at end of period (in dollars per share) | 11.60 | $ 11.60
Exercisable at end of period (in dollars per share) | $ 11.60 |
Weighted- Average Remaining Contract Term |  |
Outstanding | 5 years 4 months 22 days | 5 years 7 months 21 days
Forfeited | 5 years 7 months 9 days |
Exercisable at end of period | 5 years 4 months 22 days |
Aggregated Intrinsic Value |  |
Outstanding | $ 14,183 | $ 8,961
Exercisable at end of period | $ 14,183 |
Number of Shares |  |
Outstanding at beginning of period (in shares) | 8,069 |
Vested (in shares) | (8,034) |
Forfeited (in shares) | (35) |
Outstanding at end of period (in shares) | 0 | 8,069
Weighted Average Grant Date Fair Value Per Share |  |
Outstanding at beginning of period (in dollars per share) | $ 10.09 |
Vested (in dollars per share) | 10.09 |
Forfeited (in dollars per share) | 10.09 |
Outstanding at end of period (in dollars per share) | $ 10.09 | $ 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=6415400&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=6415400&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=6415400&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=6415400&loc=d3e5070-113901 + Details
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