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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Changes in AOCI (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Changes in Accumulated Other Comprehensive Income (Loss)    
Beginning Balance $ (418) $ (433)
Other comprehensive (loss) income before reclassifications (11) 399
Amounts reclassified from accumulated other comprehensive loss (2) 17
Net current period change in accumulated other comprehensive (loss) income (13) 416
Ending Balance (431) (17)
Accumulated Net Unrealized Investment Gain Loss    
Changes in Accumulated Other Comprehensive Income (Loss)    
Beginning Balance (214) (444)
Other comprehensive (loss) income before reclassifications (3) 456
Amounts reclassified from accumulated other comprehensive loss (2) 17
Net current period change in accumulated other comprehensive (loss) income (5) 473
Ending Balance (219) 29
Cumulative Translation Adjustment    
Changes in Accumulated Other Comprehensive Income (Loss)    
Beginning Balance (204) 11
Other comprehensive (loss) income before reclassifications (8) (57)
Net current period change in accumulated other comprehensive (loss) income (8) (57)
Ending Balance $ (212) $ (46)