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Summary of Significant Accounting Policies - Contract Fulfillment Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Intake Costs asset
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Gross Carrying Amount	$ 34,915	$ 39,748
Accumulated Amortization	(19,398)	(24,504)
Net Carrying Amount	15,517	15,244
Capitalized commissions asset
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Gross Carrying Amount	48,564	58,424
Accumulated Amortization	(17,895)	(34,637)
Net Carrying Amount	$ 30,669	$ 23,787

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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=118944033&loc=SL49130531-203044

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 8
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-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
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-Section 50
-Paragraph 8
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