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CONTRACT ASSETS AND CONTRACT LIABILITIES (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Contract Assets
Balance at beginning of year	$ 366,168
Recognized in current year	426,829
Reclassified to accounts receivable	(432,307)
Foreign currency impact	(15,105)
Balance at December 31, 2018	345,585
Contract Liabilities
Balance at beginning of year	463,704
Recognized in current year	230,159
Amounts in beginning balance reclassified to revenue	(199,735)
Current year amounts reclassified to revenue	(30,914)
Foreign currency impact	(18,409)
Balance at December 31, 2018	$ 444,805

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