Annual report pursuant to Section 13 and 15(d)

Leases - Future Minimum Payments under Operating Leases Having Initial or Remaining Non-cancelable Lease Terms in Excess of One Year (Details)

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Leases - Future Minimum Payments under Operating Leases Having Initial or Remaining Non-cancelable Lease Terms in Excess of One Year (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
Operating leases, 2019 $ 2,450
Operating leases, 2020 2,212
Operating leases, 2021 1,593
Operating leases, 2022 1,273
Operating leases, 2023 1,215
Operating leases, Thereafter 917
Operating leases, Total minimum payments $ 9,660