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, 2018
Dec. 31, 2017
Dec. 31, 2016
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period $ 34,967 $ 21,575 $ 12,650
Increases to state valuation allowance 50 10,010 6,768
Increases due to foreign valuation allowances 2,852 7,578 2,157
Decrease due to Brazilian PERT Program 0 (4,196) 0
Balance at end of period $ 37,869 $ 34,967 $ 21,575