Annual report pursuant to Section 13 and 15(d)

INCOME TAXES Reconciliation of Valuation Allowance (Details)

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INCOME TAXES Reconciliation of Valuation Allowance (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 37,869 $ 34,967 $ 21,575
Increases to state valuation allowance 1,616 50 10,010
Increases due to foreign valuation allowances 2,007 2,852 7,578
Decrease due to Brazilian PERT Program 0 0 (4,196)
Balance at end of period $ 41,492 $ 37,869 $ 34,967