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ACCUMULATED OTHER COMPREHENSIVE LOSS (Reclassification out of AOCI) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other (expense) income $ 0 $ 3,388 $ 0
Unrealized holding gains on available-for-sale investments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Other (expense) income $ 0 $ 3,388 $ 0