Annual report pursuant to Section 13 and 15(d)

Other Assets

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Other Assets
12 Months Ended
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets Other Assets
Other assets consist of the following (in thousands): 
 
 
December 31,
 
 
2019
 
2018
Costs to obtain contracts
 
$
268,964

 
$
219,307

Costs to obtain contracts- incentives
 
2,481

 

Accumulated amortization of costs to obtain contracts
 
(36,925
)
 
(24,992
)
Unbilled receivables
 
104,346

 
81,703

Operating lease right-of-use assets
 
34,678

 
20,257

Other assets
 
34,859

 
39,410

Total
 
$
408,403

 
$
335,685


The Company recorded amortization of costs to obtain contracts of $11.8 million and $8.6 million for the years ended December 31, 2019 and 2018, respectively, in the sales and marketing expense.

The majority of unbilled receivables arise from fixed price escalators included in our long-term Customer Agreements.  The escalator is included in calculating the total estimated transaction value for an individual Customer Agreement.  The total estimated transaction value is then recognized over the term of the Customer Agreement. The amount of unbilled receivables increases while cumulative billings for an individual Customer Agreement are less than the cumulative revenue recognized for that Customer Agreement.  Conversely, the amount of unbilled receivables decreases when the actual cumulative billings becomes higher than the cumulative revenue recognized. At the end of the initial term of a Customer Agreement, the cumulative amounts recognized as revenue and billed to date are the same, therefore the unbilled receivable balance for an individual Customer Agreement will be zero.