Annual report pursuant to Section 13 and 15(d)

NATURE OF OPERATIONS AND ACCOUNTING POLICIES - Schedule of Allowance for Doubtful Accounts (Details)

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NATURE OF OPERATIONS AND ACCOUNTING POLICIES - Schedule of Allowance for Doubtful Accounts (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
Write-offs 0 0 (4,196)
Balance at end of period 41,492 37,869 34,967
Allowance for Doubtful Accounts      
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]      
Balance at beginning of period 261 1,196 1,219
Additional allowances charged to expense 41 82 144
Recovery of previously reserved accounts (100) (127) (82)
Write-offs (145) (760) (68)
Foreign currency adjustments (2) (130) (17)
Balance at end of period $ 55 $ 261 $ 1,196