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Shareholders' Equity: (Tables)

6 Months Ended

Jun. 30, 2012

Shareholders' Equity:

Schedule of stock option activity under the 2001 Plan, 2010 Plan and Nonemployee Directors Plan

		Number of Shares		Weighted Average Exercise Price			Weighted Average Remaining Contractual Life (years)		Intrinsic Value
Outstanding at December 31, 2011		668,614		$	24.31		6.62		$	22,101,800
Granted		72,500		53.30
Exercised		(119,662	)	20.31
Outstanding at June 30, 2012		621,452		$	28.47		7.03		$	18,695,300
Exercisable at June 30, 2012		341,309		$	18.83		5.74		$	13,016,600

Schedule of weighted average assumptions and results used in estimation of fair value of options granted

		Six Months Ended
		June 30, 2012			June 25, 2011
Risk free interest interest rate		0.88		%	1.94		%
Expected life (years)		6			6
Expected volatility		31.4		%	28.0		%
Dividend yield		2.06		%	.32		%
Option fair value		$	12.95		$	11.28

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- Definition

Tabular disclosure of the number and weighted-average exercise prices (or conversion ratios) for share options (or share units) that were outstanding at the beginning and end of the year, vested and expected to vest, exercisable or convertible at the end of the year, and the number of share options or share units that were granted, exercised or converted, forfeited, and expired during the year.

+ References

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)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (f)(2)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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