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SHORT-TERM INVESTMENTS: (Details) (USD $)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Investments          
Trading securities $ 202,800,000   $ 202,800,000   $ 202,600,000
Weighted average interest rate (as a percent)     2.36%   3.78%
Available for sale 5,200,000   5,200,000   5,700,000
Weighted average interest rate (as a percent)     0.42%   0.42%
Total short-term investments 207,986,000   207,986,000   208,268,000
Trading securities:          
Interest earned 1,100,000 1,900,000 3,600,000 3,900,000  
Unrealized gain (loss) at the end of the period 1,000,000 100,000 1,000,000 100,000  
Available-for-sale          
Investment redeemed 300,000   500,000 400,000  
Maximum
          
Available-for-sale          
Interest earned $ 100,000 $ 100,000 $ 100,000 $ 100,000