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Leases - Maturities of lease liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Maturities of lease liabilities:
2019	$ 1,310
2020	4,680
2021	4,068
2022	3,115
2023	3,062
Thereafter	9,881
Total undiscounted cash flows	26,116
Present values
Present values	(4,869)
Short-term lease liabilities	4,188
Long-term lease liabilities	17,059
Total lease liabilities	$ 21,247

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