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Summary of Significant Accounting Policies - Contract Fulfillment Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Intake Costs asset |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Gross Carrying Amount | $ 37,938 | $ 39,748
Accumulated Amortization | (20,974) | (24,504)
Net Carrying Amount | 16,964 | 15,244
Capitalized commissions asset |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Gross Carrying Amount | 56,585 | 58,424
Accumulated Amortization | (21,933) | (34,637)
Net Carrying Amount | $ 34,652 | $ 23,787

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