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Disaggregated Revenue and Deferred Revenue - Schedule of Disaggregation of Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Communications revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 16,470	$ 11,818	$ 46,770	$ 31,327
Residential revenue
Disaggregation of Revenue [Line Items]
Revenue	12,397	8,896	35,351	23,367
Business revenue
Disaggregation of Revenue [Line Items]
Revenue	4,025	2,861	11,256	7,779
Other
Disaggregation of Revenue [Line Items]
Revenue	48	61	163	181
Loan servicing and systems revenue
Disaggregation of Revenue [Line Items]
Revenue	113,286	112,579	342,169	327,265
Government servicing - Nelnet
Disaggregation of Revenue [Line Items]
Revenue	38,645	38,907	118,744	118,015
Government servicing - Great Lakes
Disaggregation of Revenue [Line Items]
Revenue	46,234	45,671	139,285	122,107
Private education and consumer loan servicing
Disaggregation of Revenue [Line Items]
Revenue	9,561	10,007	28,026	31,990
FFELP servicing
Disaggregation of Revenue [Line Items]
Revenue	6,089	7,422	19,208	24,259
Software services
Disaggregation of Revenue [Line Items]
Revenue	10,493	8,201	30,255	24,461
Outsourced services and other
Disaggregation of Revenue [Line Items]
Revenue	2,264	2,371	6,651	6,433
Education technology, services, and payment processing revenue
Disaggregation of Revenue [Line Items]
Revenue	74,251	58,409	213,753	167,372
Tuition payment plan services
Disaggregation of Revenue [Line Items]
Revenue	25,760	19,771	80,589	63,209
Payment processing
Disaggregation of Revenue [Line Items]
Revenue	35,138	26,956	85,428	62,908
Education technology and services
Disaggregation of Revenue [Line Items]
Revenue	13,067	11,419	46,872	40,411
Other
Disaggregation of Revenue [Line Items]
Revenue	286	263	864	844
Communications revenue
Disaggregation of Revenue [Line Items]
Revenue	16,470	11,818	46,770	31,327
Internet
Disaggregation of Revenue [Line Items]
Revenue	9,899	6,453	27,641	16,541
Television
Disaggregation of Revenue [Line Items]
Revenue	4,068	3,380	12,020	9,241
Telephone
Disaggregation of Revenue [Line Items]
Revenue	2,487	1,962	7,062	5,482
Other
Disaggregation of Revenue [Line Items]
Revenue	$ 16	$ 23	$ 47	$ 63

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+ References

No definition available.

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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