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STOCK BASED COMPENSATION: (Details Textual) (USD $)
In Thousands, except Share data, unless otherwise specified
12 Months Ended 12 Months Ended
Dec. 31, 2012
Mar. 31, 2012
Apr. 08, 2011
Grant Date [Member]
Feb. 05, 2011
Stock Incentive Plan 2011 [Member]
Dec. 31, 2012
Restricted Stock
First Anniversary [Member]
Dec. 31, 2012
Restricted Stock
Second Anniversary [Member]
Dec. 31, 2012
Restricted Stock
Third Anniversary [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)       700,000      
Share Price (in dollars per share)     $ 36.88        
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized   660,357          
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Stock Options $ 975            
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized, Period for Recognition 2 years            
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value $ 340            
Share-based Compensation Arrangement by Share-based Payment Award, Purchase Price of Common Stock, Percent         33.00% 33.00% 34.00%