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NON-CONTROLLING INTEREST: (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Non-controlling interest activity        
Balance at the beginning of the period     $ 20,979,000 $ 20,000,000
Net earnings 1,395,000 2,021,000 5,316,000 5,874,000
Dividend paid (533,000) (1,350,000) (2,253,000) (4,955,000)
Other     (100,000) (700,000)
Balance at the end of the period $ 23,939,000 $ 20,000,000 $ 23,939,000 $ 20,000,000