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Commitments and Contingencies - State and Local Taxes and Surcharges (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2015
USD ($)
state
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Loss Contingencies [Line Items]            
General and administrative $ 9,833 $ 6,845   $ 18,936 $ 15,705  
Accrued sales tax liability, current 1,201     1,201   $ 1,326
Contingent sales tax liabilities            
Loss Contingencies [Line Items]            
Number of states with sales taxes liability | state     4      
General and administrative     $ 600      
Sales tax liability 1,300     1,300   1,500
Accrued sales tax liability, current $ 300     $ 300   $ 400