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Leases - Maturities of operating lease liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 01, 2019
Leases
2019, excluding the quarter ended September, 2019	$ 2,039
2020	7,163
2021	5,562
2022	3,313
2023	2,279
Thereafter	2,941
Total lease payments	23,297
Less imputed interest	(2,020)
Present value of lease liabilities	$ 21,277	$ 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
-URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980

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+ References

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