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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Changes in AOCI by Component      
Balance at the beginning $ 975,027 $ 1,029,699 $ 1,105,966
Other comprehensive income     21
Balance at the end 1,053,307 975,027 1,029,699
Net Unrealized Gain (Loss) on Investments      
Changes in AOCI by Component      
Balance at the beginning 0 0 (21)
OCI before reclassifications     (2,385)
Amounts reclassified from AOCI     2,406
Other comprehensive income 0 0 21
Balance at the end $ 0 $ 0 $ 0