SHAREHOLDERS' EQUITY AND SHARE-BASED COMPENSATION - Restricted stock awards (Details) - Restricted Shares	12 Months Ended
Dec. 31, 2017 $ / shares shares
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Other than options, outstanding (in shares)	231,730
Other than options, granted (in shares)	245,655
Share-based compensation arrangement by share-based payment award, equity instruments other than options, grants in period, weighted average grant date fair value (in dollars per share) \| $ / shares	$ 29.93
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Restricted shares outstanding, beginning of period (in shares)	231,730
RSUs granted (in shares)	245,655
RSUs issued (in shares)	(55,385)
RSUs forfeited/canceled (in shares)	(65,491)
Restricted shares outstanding, beginning of period (in shares)	356,509
Performance-Based, Vesting Period One
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage	33.00%
Vesting Based on Service
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Share-based compensation arrangement by share-based payment award, alternate award vesting period	2 years
Other than options, outstanding (in shares)	315,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Restricted shares outstanding, beginning of period (in shares)	315,000
Performance-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Other than options, outstanding (in shares)	42,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Restricted shares outstanding, beginning of period (in shares)	42,000
Performance-Based, Vesting Period Two
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Share-based compensation arrangement by share-based payment award, award vesting rights, percentage	33.00%
Minimum \| Vesting Based on Service
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Vesting period	1 year
Minimum \| Performance-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Attainment above threshold performance levels, vesting percentage	80.00%
Maximum \| Vesting Based on Service
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Vesting period	4 years
Maximum \| Performance-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Attainment above threshold performance levels, vesting percentage	150.00%

[Line Items] for Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Table]

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Share-based Compensation Arrangement by Share-based Payment Award, Alternate Award Vesting Period

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The weighted average fair value at grant date for nonvested non-option equity-based awards issued during the period.

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Share-based Compensation Arrangement by Share-based Payment Award, Options, Attainment Exceeds Target, Vesting, Percentage

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Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of shares under non-option equity instrument agreements that were either cancelled or expired.

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Net number of non-option equity instruments granted to participants.

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Other increase (decrease) in number of shares reserved for issuance under non-option equity instrument agreements that is not separately disclosed.

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Number of equity instruments other than options outstanding, including both vested and non-vested instruments.

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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

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)(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Percentage of vesting of share-based compensation awards.

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