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LEASES - Maturities of lease liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
LEASES
2019 (excluding the three months ended March 31, 2019)	$ 8,356
2020	12,746
2021	11,591
2022	10,816
2023	10,097
Thereafter	27,319
Total lease payments	80,925
Less imputed interest	(13,739)
Total	$ 67,186
Maturities of lease liabilities as of December 31, 2018
2019		$ 11,801
2020		12,650
2021		11,491
2022		10,713
2023		9,990
Thereafter		27,325
Total lease payments		$ 83,970

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