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Leases - Narrative (Details)
$ in Thousands
 1 Months Ended 3 Months Ended 12 Months Ended
Jan. 31, 2021
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2020
USD ($)
lease
Dec. 31, 2018
USD ($)
Operating Leased Assets [Line Items]        
Rent expense       $ 4,900
Impairment of ROU asset   $ 800    
Number of operating leases not yet commenced | lease     4  
Initial lease liability of operating leases that have not yet commenced     $ 400  
Operating lease right-of-use assets   $ 19,826 $ 19,522  
Prepaid lease assets, remaining amortization period   4 years 3 months 18 days 3 years 8 months 12 days  
Net book value of asset   $ 90,732 $ 87,285  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]   us-gaap:OtherAccruedLiabilitiesCurrent us-gaap:OtherAccruedLiabilitiesCurrent  
Subsequent event        
Operating Leased Assets [Line Items]        
Lease liability reversal $ 700      
Three-year term        
Operating Leased Assets [Line Items]        
Term of operating lease that has not yet commenced     2 years  
Four-year term        
Operating Leased Assets [Line Items]        
Term of operating lease that has not yet commenced     4 years  
Yangzhou        
Operating Leased Assets [Line Items]        
Operating lease right-of-use assets     $ 2,400  
Prepaid lease assets, remaining amortization period     38 years  
Yangzhou | Buildings on prepaid land        
Operating Leased Assets [Line Items]        
Net book value of asset     $ 16,900  
Remaining depreciable period of asset     19 years  
Property subject to rent escalations | Maximum        
Operating Leased Assets [Line Items]        
Lessee term of contract     40 years