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RETIREMENT PLANS: (Details 5) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Fair value of plan assets	$ 57,491	$ 53,935	$ 48,464
Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	46,894	45,369
Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	10,597	8,566
Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Equity Securities [Member]
Fair value of plan assets	43,393	40,475
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	43,393	40,475
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	0	0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Convertible Debt Securities [Member]
Fair value of plan assets	10,597	8,566
Convertible Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	0	0
Convertible Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	10,597	8,566
Convertible Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	0	0
Investment Funds [Member]
Fair value of plan assets	3,501	4,894
Investment Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Fair value of plan assets	3,501	4,894
Investment Funds [Member] | Fair Value, Inputs, Level 2 [Member]
Fair value of plan assets	0	0
Investment Funds [Member] | Fair Value, Inputs, Level 3 [Member]
Fair value of plan assets	$ 0	$ 0

X

- Definition

Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 30

-Section 35

-Paragraph 50

-URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930



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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 87

-Paragraph 49

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph d(iv)(b)(i)

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 132R

-Paragraph 5

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 715

-SubTopic 20

-Section 50

-Paragraph 1

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920

+ Details

Name:	us-gaap_DefinedBenefitPlanFairValueOfPlanAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant