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LEASES - Maturities of lease liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
LEASES
2019 (excluding the three months ended June 30, 2019)	$ 6,637
2020	13,459
2021	12,162
2022	11,351
2023	10,544
Thereafter	28,236
Total lease payments	82,389
Less imputed interest	(13,620)
Total	$ 68,769
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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