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The percentage of deduction to be applied on amount payable to employee in the case of involuntary termination.

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No definition available.

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The percentage of deduction to be applied on amount payable to employee in the case of voluntary resignation.

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No definition available.

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Represents the ratio of bonus granted to the participant upon meeting the eligibility period of the share based compensation plan.

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No definition available.

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The period after which the employee has purchased shares through the plan through payroll deductions and is therefore eligible for the bonus grant.

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No definition available.

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- Definition

Represents the percentage of title acquired by the employee in every two years on shares paid in previous two years.

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No definition available.

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- Definition

Represents the purchase price of shares for the initial subscription as a part of share based compensation award plan.

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No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Unrecognized cost of unvested share-based compensation awards.

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- Definition

The equity interest of noncontrolling shareholders, partners or other equity holders in consolidated entity.

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No definition available.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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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.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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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.

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STOCKHOLDERS' EQUITY - Compensation Plan (Details) $ / shares in Units, $ in Millions	1 Months Ended				12 Months Ended
	Nov. 30, 2018 $ / shares	Nov. 30, 2018 $ / shares	Jan. 31, 2015 $ / shares	Jan. 31, 2015 $ / shares	Dec. 31, 2018 USD ($) $ / shares shares	Dec. 31, 2017 USD ($) $ / shares shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2010 $ / shares	Dec. 31, 2010 $ / shares
Peruvian Operations
Non-controlling interest
Investment shareholders' interest in Peruvian Branch (as a percent)					0.71%
Employee Stock Purchase 2010 Plan
Information related to compensation cost
Purchase price for initial subscription (in dollars per share) \| (per share)								$ 1.28	$ 26.51
Percentage of title acquired by employee in every two years on shares paid in previous two years					50.00%
Period of plan					8 years
Ratio of bonus shares granted to participant					0.1
Stock based compensation expense \| $					$ 0.2	$ 0.6	$ 0.6
Unrecognized compensation expense \| $						$ 0.2	$ 0.8
Stock award activity, Shares
Outstanding shares at the beginning of the period \| shares					1,393,663	1,401,096
Exercised (in shares) \| shares					(1,275,729)	(7,433)
Outstanding shares at the end of the period \| shares					117,934	1,393,663	1,401,096
Unit Weighted Average Grant Date Fair Value
Outstanding shares at the beginning of the period (in dollars per share) \| $ / shares					$ 2.05	$ 2.05
Exercised (in dollars per share) \| $ / shares					2.05	2.05
Outstanding shares at the end of the period (in dollars per share) \| $ / shares					2.05	$ 2.05	$ 2.05
Employee Stock Purchase 2015 Plan
Information related to compensation cost
Purchase price for initial subscription (in dollars per share) \| (per share)			$ 1.86	$ 38.44	$ 1.86
Percentage of title acquired by employee in every two years on shares paid in previous two years					50.00%
Period of plan					8 years
Ratio of bonus shares granted to participant					0.1
Stock based compensation expense \| $					$ 0.6	$ 0.6	$ 0.6
Unrecognized compensation expense \| $					$ 2.6	$ 3.2	$ 3.8
Stock award activity, Shares
Outstanding shares at the beginning of the period \| shares					2,293,120	2,540,223
Exercised (in shares) \| shares					(452,784)	(247,103)
Outstanding shares at the end of the period \| shares					1,840,336	2,293,120	2,540,223
Unit Weighted Average Grant Date Fair Value
Outstanding shares at the beginning of the period (in dollars per share) \| $ / shares					$ 2.63	$ 2.63
Exercised (in dollars per share) \| $ / shares					2.63	2.63
Outstanding shares at the end of the period (in dollars per share) \| $ / shares					$ 2.63	$ 2.63	$ 2.63
Employee Stock Purchase 2018 Plan
Information related to compensation cost
Purchase price for initial subscription (in dollars per share) \| (per share)	$ 1.86	$ 37.89
Percentage of title acquired by employee in every two years on shares paid in previous two years	50.00%	50.00%
Period of plan	8 years	8 years
Ratio of bonus shares granted to participant	0.1	0.1
Unrecognized compensation expense \| $					$ 3.6
Stock award activity, Shares
Granted in the period \| shares					2,782,424
Outstanding shares at the end of the period \| shares					2,782,424
Unit Weighted Average Grant Date Fair Value
Granted (in dollars per share) \| $ / shares					$ 1.86
Outstanding shares at the end of the period (in dollars per share) \| $ / shares					$ 1.86
Employee Stock Purchase 2018 Plan \| Resignation occurs during 1st year after grant date
Information related to compensation cost
Percentage of deduction for voluntary resignation					90.00%
Percentage of deduction for involuntary termination					100.00%
Employee Stock Purchase 2018 Plan \| Resignation occurs during 2nd year after grant date
Information related to compensation cost
Percentage of deduction for voluntary resignation					80.00%
Percentage of deduction for involuntary termination					95.00%
Employee Stock Purchase 2018 Plan \| Resignation occurs during 3rd year after grant date
Information related to compensation cost
Percentage of deduction for voluntary resignation					70.00%
Percentage of deduction for involuntary termination					90.00%
Employee Stock Purchase 2018 Plan \| Resignation occurs during 4th year after grant date
Information related to compensation cost
Percentage of deduction for voluntary resignation					60.00%
Percentage of deduction for involuntary termination					80.00%
Employee Stock Purchase 2018 Plan \| Resignation occurs during 5th year after grant date
Information related to compensation cost
Percentage of deduction for voluntary resignation					50.00%
Percentage of deduction for involuntary termination					70.00%
Employee Stock Purchase 2018 Plan \| Resignation occurs during 6th year after grant date
Information related to compensation cost
Percentage of deduction for voluntary resignation					40.00%
Percentage of deduction for involuntary termination					60.00%
Employee Stock Purchase 2018 Plan \| Resignation occurs during 7th year after grant date
Information related to compensation cost
Percentage of deduction for voluntary resignation					20.00%
Percentage of deduction for involuntary termination					50.00%