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Leases - Narrative (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Operating Leased Assets [Line Items] |  |  |  |
Rent expense |  |  | $ 4,900 | $ 4,200
Impairment of ROU asset | $ 800 |  |  |
Short-term lease costs |  | $ 1,300 |  |
Number of operating leases not yet commenced | 1 | 1 |  |
Initial lease liability of operating leases that have not yet commenced | $ 1,600 | $ 1,600 |  |
Term of operating lease that has not yet commenced | 5 years | 5 years |  |
Liability related to rent escalations |  |  | 1,100 |
Allowance for moving expenses and tenant improvements |  |  | 1,800 |
Operating lease right-of-use assets | $ 19,826 | $ 19,826 |  |
Prepaid lease assets, remaining amortization period | 4 years 3 months 18 days | 4 years 3 months 18 days |  |
Net book value of asset | $ 90,732 | $ 90,732 | $ 95,840 |
Minimum |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Recognition period for rent expense |  |  | 48 months |
Maximum |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Recognition period for rent expense |  |  | 125 months |
Yangzhou |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Operating lease right-of-use assets | $ 2,400 | $ 2,400 |  |
Prepaid lease assets, remaining amortization period | 39 years | 39 years |  |
Yangzhou | Buildings on Prepaid Land |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Net book value of asset | $ 17,100 | $ 17,100 |  |
Remaining depreciable period of asset |  | 20 years |  |
Property Subject to Rent Escalations | Maximum |  |  |  |
Operating Leased Assets [Line Items] |  |  |  |
Lessee term of contract | 41 years | 41 years |  |

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