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Shareholders' Equity: (Details) (USD $) In Millions, except Share data, unless otherwise specified	0 Months Ended				9 Months Ended
	Jul. 30, 2014	Apr. 30, 2014	Feb. 04, 2014	Jan. 29, 2014	Sep. 27, 2014 Common Stock Repurchase Program
Dividends
Cash dividend approved by Board of Directors (in dollars per share)	$ 0.06	$ 0.06		$ 0.05
Special cash dividend approved by Board of Directors (in dollars per share)			$ 5.00
Total special dividend in cash			$ 25.8
Borrowings on line of credit for special dividend			13.0
Repurchase of Common Stock
Number of shares repurchased					166,030
Aggregate purchase price of shares repurchased (in dollars)					$ 11.6
Aggregate purchase price per share of shares repurchased (in dollars per share)					$ 69.65
Number of additional shares that can be repurchased					166,700

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Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

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-Name Accounting Standards Codification

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Number of shares that have been repurchased and retired during the period.

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

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-Topic 505

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

+ References

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

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Reference 2: http://www.xbrl.org/2003/role/presentationRef

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The remaining number of shares authorized to be repurchased by an entity's Board of Directors under a stock repurchase plan.

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Represents the aggregate special cash dividends declared during the period for each share of common stock outstanding.

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The price paid per share for shares repurchased and retired during the period.

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Equity impact of special common stock cash dividends declared by the entity during the period. This element includes paid and unpaid dividends declared during the period.

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