Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details)

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VALUATION AND QUALIFYING ACCOUNTS AND RESERVES (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reserve for bad debts and allowances [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balances at beginning of period $ 2,735 $ 1,687 $ 1,357
Charged to costs and expenses 1,657 1,665 991
Charged to other accounts
Charged to income 1,593 617 661
Charged to other accounts
Balances at end of period 2,799 2,735 1,687
Valuation allowances on deferred tax assets [Member]      
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]      
Balances at beginning of period 152,062 201,376 152,115
Charged to costs and expenses 597 22,998 49,261
Charged to other accounts
Charged to income 65,572
Charged to other accounts 6,740
Balances at end of period $ 152,659 $ 152,062 $ 201,376