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Summary of Significant Accounting Policies - Revenue - Contract Fulfillment Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Jan. 01, 2018
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Commissions asset |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net Carrying Amount | $ 20,478 |
Accumulated Amortization | (28,355) | $ (21,173)
Gross Carrying Amount | 48,833 | 42,072
Intake Costs asset |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net Carrying Amount | 15,508 |
Accumulated Amortization | (20,135) | (14,954)
Gross Carrying Amount | $ 35,643 | 31,604
Accounting Standards Update 2014-09 | Commissions asset |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net Carrying Amount |  | 20,899
Accounting Standards Update 2014-09 | Intake Costs asset |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |
Net Carrying Amount |  | $ 16,650

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