2103100 - Disclosure - Accumulated Other Comprehensive Loss: link:presentationLink link:calculationLink link:definitionLink 2403402 - Disclosure - Accumulated Other Comprehensive Loss: (Details) link:presentationLink link:calculationLink link:definitionLink 2303301 - Disclosure - Accumulated Other Comprehensive Loss: (Tables) link:presentationLink link:calculationLink link:definitionLink 2101100 - Disclosure - Basis of Presentation: link:presentationLink link:calculationLink link:definitionLink 2401402 - Disclosure - Basis of Presentation: (Details) link:presentationLink link:calculationLink link:definitionLink 2201201 - Disclosure - Basis of Presentation: (Policies) link:presentationLink link:calculationLink link:definitionLink 1001000 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 1001501 - Statement - CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) link:presentationLink link:calculationLink link:definitionLink 1005000 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 1003000 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 1002000 - Statement - CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) link:presentationLink link:calculationLink link:definitionLink 0001000 - Document - Document and Entity Information link:presentationLink link:calculationLink link:definitionLink 2104100 - Disclosure - Income Taxes: link:presentationLink link:calculationLink link:definitionLink 2404401 - Disclosure - Income Taxes: (Details) link:presentationLink link:calculationLink link:definitionLink 2102100 - Disclosure - Operating Group Information: link:presentationLink link:calculationLink link:definitionLink 2402402 - Disclosure - Operating Group Information: (Details) link:presentationLink link:calculationLink link:definitionLink 2302301 - Disclosure - Operating Group Information: (Tables) link:presentationLink link:calculationLink link:definitionLink