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

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- Definition

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

+ References

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- Definition

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

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- Definition

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

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- Definition

Share-based compensation arrangement by share-based payment award, plan modification, number of non-option equity investments, affected

+ References

No definition available.

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- Definition

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.

+ References

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- Definition

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

+ References

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- Definition

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

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- Definition

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

+ References

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- Definition

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

+ 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)(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&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)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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- Definition

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

+ References

No definition available.

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- Definition

Percentage of vesting of share-based compensation awards.

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SHAREHOLDERS' EQUITY AND SHARE-BASED COMPENSATION - Restricted stock awards (Details) - $ / shares	3 Months Ended		12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017	Dec. 31, 2018
Restricted Shares and Restricted Share Units
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Other than options, outstanding (in shares)	356,509	356,509	356,509
Other than options, granted (in shares)			375,524
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)			$ 21.57
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding, beginning of period (in shares)	356,509		356,509
Granted (in shares)			375,524
Issued (in shares)			(111,565)
Forfeited/canceled (in shares)			(134,662)
Outstanding, end of period (in shares)		356,509	485,806
Restricted Shares and Restricted Share Units \| 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%
Restricted Shares and Restricted Share Units \| 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%
Restricted Shares and Restricted Share Units \| Performance-Based, Vesting Period Three
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%
Restricted Shares and Restricted Share Units \| 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)			482,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding, end of period (in shares)			482,000
Restricted Shares and Restricted Share Units \| Performance-Based
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Other than options, outstanding (in shares)			4,000
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Outstanding [Roll Forward]
Outstanding, end of period (in shares)			4,000
Restricted Shares
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Share-based compensation arrangement by share-based payment award, plan modification, number of instruments other than options, affected (in shares)	31,000	31,000
Minimum \| Restricted Shares and Restricted Share Units \| Vesting Based on Service
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Vesting period			1 year
Minimum \| Restricted Shares and Restricted Share Units \| 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 \| Restricted Shares and Restricted Share Units \| Vesting Based on Service
Schedule of Share-based compensation, Restricted Stock and Restricted Stock units activity [Line Items]
Vesting period			4 years
Maximum \| Restricted Shares and Restricted Share Units \| 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%