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Commitments and Contingencies - Narrative (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loss Contingencies [Line Items]        
Restricted cash $ 2,015 $ 2,047 $ 1,967 $ 1,851
Vendor Commitments:        
Total vendor commitments 94,196      
2020 41,807      
2021 26,952      
2022 21,892      
2023 3,545      
Collection and remittance of state and municipal taxes | Threatened litigation        
Vendor Commitments:        
Reserve for potential tax liability pending new requirements from state or municipal agencies 3,175      
Standby Letter of Credit        
Loss Contingencies [Line Items]        
Restricted cash $ 1,528 $ 1,516