Annual report pursuant to Section 13 and 15(d)

INCOME TAXES Summary of Income Tax Contingencies (Details)

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INCOME TAXES Summary of Income Tax Contingencies (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Beginning balance $ 11 $ 261 $ 648
Reductions due to settlements with taxing authorities 0 (250) (570)
Increases due to tax positions taken during the current year 0 0 183
Ending balance $ 11 $ 11 $ 261