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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

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