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Leases - Maturities of operating lease liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jan. 01, 2019
Leases
2019, excluding the quarter ended March 31, 2019	$ 4,586
2020	8,085
2021	5,939
2022	3,411
2023	1,979
Thereafter	2,642
Total lease payments	26,642
Less imputed interest	(1,749)
Present value of lease liabilities	$ 24,893	$ 27,800

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Amount of lessee's undiscounted obligation for lease payments for operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 6
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