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Leases - Maturities of lease liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Maturities of lease liabilities:
2019	$ 2,662
2020	4,767
2021	4,133
2022	3,178
2023	3,148
Thereafter	4,422
Total undiscounted cash flows	22,310
Present values
Present values	(3,169)
Short-term lease liabilities	4,576
Long-term lease liabilities	14,565
Total lease liabilities	$ 19,141

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-Publisher FASB
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