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

+ References

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 1

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Section S99

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-Publisher SEC

-Name Staff Accounting Bulletin (SAB)

-Number Topic 14

-Section F

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Unrecognized cost of unvested share-based compensation awards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

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

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

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-Section 50

-Paragraph 2

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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

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-Paragraph 2

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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).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

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- Definition

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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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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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.

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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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-Name Accounting Standards Codification

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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: (Details 4) In Millions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014 Employee Stock Purchase Plan USD ($)	Dec. 31, 2013 Employee Stock Purchase Plan USD ($)	Dec. 31, 2012 Employee Stock Purchase Plan USD ($)	Dec. 31, 2014 New Employee Stock Purchase Plan USD ($)	Dec. 31, 2013 New Employee Stock Purchase Plan USD ($)	Dec. 31, 2012 New Employee Stock Purchase Plan USD ($)	Dec. 31, 2010 New Employee Stock Purchase Plan USD ($)	Dec. 31, 2010 New Employee Stock Purchase Plan MXN
Information related to compensation cost
Stock based compensation expense	$ 2.1	$ 2.1	$ 2.1	$ 0.6	$ 0.6	$ 0.6
Unrecognized compensation expense		$ 2.1	$ 4.2	$ 2.0	$ 2.6	$ 3.2
Period over which unrecognized compensation expense expected to be recognized				4 years
Stock award activity, Shares
Outstanding shares at the beginning of the period	4,449,599	6,955,572		3,012,464	2,944,742
Granted (in shares)					226,613
Exercised (in shares)	(150,987)	(2,474,814)		(724,573)	(38,098)
Forfeited (in shares)		(31,159)			(120,793)
Outstanding shares at the end of the period	4,298,612	4,449,599	6,955,572	2,287,891	3,012,464	2,944,742
Unit Weighted Average Grant Date Fair Value
Outstanding shares at the beginning of the period (in dollars per share)	$ 1.16	$ 1.16		$ 2.05	$ 2.05
Granted (in dollars per share)					$ 2.05
Exercised (in dollars per share)	$ 1.16	$ 1.16		$ 2.05	$ 2.05
Forfeited (in dollars per share)	$ 1.16	$ 1.16			$ 2.05
Outstanding shares at the end of the period (in dollars per share)	$ 1.16	$ 1.16	$ 1.16	$ 2.05	$ 2.05	$ 2.05
Purchase price for initial subscription (in dollars per share)							$ 2.05	26.51