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INVESTMENTS INVESTMENTS - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Gain (Loss) on Investments [Line Items]        
Available-for-sale Securities, Gross Realized Gains (Losses), Sale Proceeds $ 64,800 $ 53,900 $ 107,500 $ 54,000
Available-for-sale Securities, Gross Realized Gains 0 1,100 300 1,100
Available-for-sale Securities, Gross Realized Losses $ 200 $ 0 $ 500 $ 0