Income Taxes - Tax Receivable Agreement (Details) - USD ($) $ in Thousands	May 29, 2014	Mar. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Payable pursuant to tax receivable agreement		$ 0	$ 70,529
Tax Receivable Agreement | IPO
Operating Loss Carryforwards [Line Items]
Payment of net cash savings from tax, percent	85.00%
Payable pursuant to tax receivable agreement			$ 70,500