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Other Assets
 6 Months Ended
Jun. 30, 2018
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets
Other Assets
Other assets consist of the following (in thousands): 
 
 
June 30, 2018
 
December 31, 2017
Costs to obtain contracts
 
$
183,870

 
$
157,970

Accumulated amortization of costs to obtain contracts
 
(20,376
)
 
(16,485
)
Operating lease right-of-use assets
 
21,620

 
25,465

Other assets
 
59,727

 
27,804

Total
 
$
244,841

 
$
194,754


The Company recorded amortization of costs to obtain contracts of $2.1 million and $1.6 million for the three months ended June 30, 2018 and 2017, respectively, and $4.0 million and $3.1 million for the six months ended June 30, 2018 and 2017, respectively, in the sales and marketing expense.