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Deferred Costs (Tables)
 12 Months Ended
Dec. 31, 2018
Deferred Costs [Abstract]  
Summary of Deferred Costs and Amortization of Deferred Costs

The table below presents the activity of deferred costs and amortization of deferred costs (in thousands):

 

 

 

Year Ended December 31,

 

 

 

2018

 

 

2017

 

Balances, at beginning of period

 

$

39,933

 

 

$

32,117

 

Incurred deferred costs

 

 

49,583

 

 

 

44,628

 

Amortized deferred costs

 

 

(44,041

)

 

 

(36,812

)

Balances, at end of period

 

$

45,475

 

 

$

39,933