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STOCK BASED COMPENSATION: (Details) (Restricted Stock, USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Restricted Stock
Number Outstanding, Nonvested balance at January 1 2012	0
Number Outstanding, Granted during the year	39,643
Number Outstanding, Vested during the year	13,212
Number Outstanding, Forfeited during the year	0
Number Outstanding, Novested balance at December 31, 2012	26,431
Weighted Average Grant Date Fair Value Nonvested balance at January 1 2012	$ 0
Weighted Average Grant Date Fair Value Granted during the year	$ 36.88
Weighted Average Grant Date Fair Value Vested during the year	$ 30.24
Weighted Average Grant Date Fair Value Forfeited during the year	$ 0
Weighted Average Grant Date Fair Value Nonvested balance at December 31, 2012	$ 36.88

X

- Definition

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

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

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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.

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- Definition

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).

+ References

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

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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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-Topic 718

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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.

+ References

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

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