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EMPLOYEE BENEFIT PLANS: (Tables) | 12 Months Ended
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Dec. 31, 2011
EMPLOYEE BENEFIT PLANS: |
Schedule of amounts recognized in accumulated other comprehensive loss (pre-tax) |
Prior service credit |  | $ | (626 | )
Net actuarial loss |  | 8,255 |
Net amount recognized in accumulated other comprehensive loss |  | $ | 7,629 |
Schedule of changes in accumulated postretirement benefit obligation |
|  | December 31 |
|  | 2011 |  | 2010 |
Benefit obligation, beginning of year |  | $ | 20,689 |  | $ | 16,674 |
Service cost |  | 831 |  | 696 |
Interest cost |  | 1,117 |  | 958 |
Actuarial loss |  | 3,898 |  | 2,714 |
Benefits paid |  | (427 | ) | (353 | )
Benefit obligation, end of year |  | $ | 26,108 |  | $ | 20,689 |
Schedule of net periodic postretirement benefit cost |
|  | 2011 |  | 2010 |  | 2009 |
Service cost—benefits attributed to service during the period |  | $ | 831 |  | $ | 696 |  | $ | 704 |
Interest cost on the accumulated postretirement benefit obligation |  | 1,117 |  | 958 |  | 853 |
Net amortization |  | 501 |  | 128 |  | 140 |
Net periodic postretirement benefit cost |  | $ | 2,449 |  | $ | 1,782 |  | $ | 1,697 |
Schedule of increasing or decreasing health care trend rates by one percentage point |
|  | 1% Increase |  | 1% Decrease |
Postretirement benefit obligation |  | $ | 6,247 |  | $ | (4,277 | )
Total of service and interest cost components |  | $ | 484 |  | $ | (320 | )

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- Definition Tabular disclosure of the change in the accumulated postemployment benefit obligation from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph (a) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 -Subparagraph (m) + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph (h) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts related to pension plans and/or other employee benefit plans in accumulated other comprehensive income or loss that have not yet been recognized as components of net periodic benefit cost, such as the net gain (loss), net prior service cost or credit, and net transition asset or obligation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Topic 715 -SubTopic 20 -Publisher FASB -Number -Article -Subparagraph (j) -Name Accounting Standards Codification -Paragraph 1 -Section 50 -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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