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Summary of Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2017
Summary of Significant Accounting Policies  
Schedule of Annual Dues Deferred Revenue

The activity in the Company’s annual dues deferred revenue consists of the following (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Balance at beginning of period

 

New billings

 

Revenue recognized

 

Balance at end of period

Year ended December 31, 2017

 

$

14,227

 

$

34,837

 

$

(33,767)

 

$

15,297

Year ended December 31, 2016

    

$

13,106

 

$

33,774

 

$

(32,653)

 

$

14,227

Year ended December 31, 2015

 

$

12,912

 

$

31,952

 

$

(31,758)

 

$

13,106

 

Schedule of Allowances Against Accounts and Notes Receivable

The activity in the Company’s allowances against accounts and notes receivable consists of the following (in thousands):

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Additions/charges

 

 

 

 

 

 

Balance at

 

to cost and expense for

 

 

 

 

 

 

beginning of period

 

allowances for doubtful accounts

 

Deductions/write-offs

 

Balance at end of period

Year ended December 31, 2017

 

$

5,535

 

$

1,159

 

$

(491)

 

$

6,203

Year ended December 31, 2016

    

$

4,483

 

$

1,325

 

$

(273)

 

$

5,535

Year ended December 31, 2015

 

$

4,495

 

$

353

 

$

(365)

 

$

4,483