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Leases - Future minimum lease payments under operating leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Future minimum lease payments under operating leases were:    
2019   $ 9,093
2020   7,561
2021   6,938
2022   3,862
2023   3,448
Thereafter   18,349
Total lease payments   49,251
Rent expense for operating leases $ 7,400 $ 6,500