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Summary of Significant Accounting Policies - Contract Fulfillment Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Intake Costs |  |
Contract With Customer, Asset And Liabilities [Line Items] |  |
GROSS CARRYING AMOUNT | $ 66,337 | $ 63,721
ACCUMULATED AMORTIZATION | (35,904) | (33,352)
NET CARRYING AMOUNT | 30,433 | 30,369
Commissions |  |
Contract With Customer, Asset And Liabilities [Line Items] |  |
GROSS CARRYING AMOUNT | 99,721 | 91,069
ACCUMULATED AMORTIZATION | (43,125) | (38,787)
NET CARRYING AMOUNT | $ 56,596 | $ 52,282

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- Definition Amount, before allowance for credit loss, of right to consideration in exchange for good or service transferred to customer, when right is conditioned on something other than passage of time. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130531-203044 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121556615&loc=SL49130533-203044 + Details
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