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REVENUE - Contract Assets and Contract Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018	Jan. 01, 2018
REVENUE.
Contract asset (current)	$ 15,894	$ 15,858
Increase / (decrease) in contract asset (current)	36
Contract liability (current)	68,403	68,134
Increase / (decrease) in contract liability (current)	269
Contract liability (long-term)	11,906	$ 11,261
Increase / (decrease) in contract liability (long-term)	645
Revenue recognized previously included in current contract liabilities	7,500
Unearned revenue associated with outstanding contracts	686		$ 758
Estimated revenue to be recognized in 2019	237
Estimated revenue to be recognized in 2020	268
Estimated revenue to be recognized after 2020	$ 181

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

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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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