REVENUE - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
Mar. 31, 2020	Dec. 31, 2019
REVENUE.
Contract asset (current)	$ 13,457	$ 16,245
Increase / (decrease) in contract asset (current)	(2,788)
Contract liability (current)	78,974	79,305
Increase / (decrease) in contract liability (current)	(331)
Contract liability (long-term)	14,994	9,779
Increase / (decrease) in contract liability (long-term)	5,215
Revenue recognized previously included in current contract liabilities	12,500
Revenue recognized previously included in current contract liabilities at beginning of the year	10,600
Unearned revenue associated with outstanding contracts	432	515
Estimated revenue to be recognized in 2020	172
Estimated revenue to be recognized in 2021	123
Estimated revenue to be recognized after 2021	137
Allowance for Credit Loss [Abstract]
Accounts and note receivable	602,027	558,428
Accounts and notes receivable, allowance for doubtful accounts (in dollars)	$ 5,657	$ 3,626

The amount of increase (decrease) in current contract liabilities during the period.

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The increase (decrease) in non-current contract liabilities.

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Amount of transaction price allocated to performance obligation that has not been recognized, estimated to be recognized after the second year.

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Amount of transaction price allocated to performance obligation that has not been recognized, estimated to be recognized in the following year.

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Amount of transaction price allocated to performance obligation that has not been recognized, estimated to be recognized in the remainder of the current year.

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No definition available.

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Amount, after allowance for credit loss, of accounts and financing receivables, classified as current. Includes, but is not limited to, notes and loan receivable.

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Amount of allowance for credit loss on accounts receivable, classified as current.

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Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

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Amount of decrease in right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time from transfer to receivable due to right to consideration becoming unconditional.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable, classified as noncurrent.

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Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of revenue recognized from performance obligation satisfied or partially satisfied in previous reporting periods. Includes, but is not limited to, change in transaction price.

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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