Quarterly report pursuant to Section 13 or 15(d)

Other Assets

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Other Assets
 6 Months Ended
Jun. 30, 2022
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets Other Assets
Other assets consist of the following (in thousands):
June 30, 2022 December 31, 2021
Costs to obtain contracts - customer agreements $ 882,836  $ 703,080 
Costs to obtain contracts - incentives 2,481  2,481 
Accumulated amortization of costs to obtain contracts (91,619) (74,529)
Unbilled receivables 253,514  212,727 
Allowance for credit losses on unbilled receivables (2,814) (2,411)
Equity investment 186,100  63,826 
Operating lease right-of-use assets 112,599  92,707 
Other assets 216,111  127,862 
Total $ 1,559,208  $ 1,125,743 
The Company recorded amortization of costs to obtain contracts of $9.1 million and $5.4 million for the three months ended June 30, 2022 and 2021, respectively, and $17.2 million and $9.6 million for the six months ended June 30, 2022 and 2021, respectively, in Sales and marketing in the consolidated statements of operations.
The majority of unbilled receivables arise from fixed price escalators included in the Company's 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. The Company applies an estimated loss-rate in order to determine the current expected credit loss for unbilled receivables. The estimated loss-rate is determined by analyzing historical credit losses, residential first and second mortgage foreclosures and consumers' utility default rates, as well as current economic conditions. The Company reviews individual customer collection status of electricity billings to determine whether the unbilled receivables for an individual customer should be written off, including the possibility of a service transfer to a potential new homeowner.