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Accounts Receivable, Net (Tables)
 12 Months Ended
Dec. 31, 2018
Receivables [Abstract]  
Accounts Receivable, Net

Accounts receivable, net balances at December 31, 2018 and 2017 were as follows (in thousands):

 

 

 

2018

 

 

2017

 

Trade accounts receivable

 

$

159,992

 

 

$

139,730

 

Unbilled revenue, at net realizable value

 

 

60,684

 

 

 

62,397

 

Total accounts receivable

 

 

220,676

 

 

 

202,127

 

Allowance for doubtful accounts

 

 

(13,389

)

 

 

(13,827

)

Accounts receivable, net

 

$

207,287

 

 

$

188,300

 
Schedule of Changes in the Allowance for Doubtful Accounts on Accounts Receivable

 

Changes in the allowance for doubtful accounts on accounts receivable are as follows (in thousands):

 

 

 

2018

 

 

2017

 

 

2016

 

Balance at beginning of period

 

$

(13,827

)

 

$

(13,508

)

 

$

(12,659

)

Provision for losses

 

 

(3,776

)

 

 

(5,529

)

 

 

(4,154

)

Charge-offs, net of recoveries

 

 

4,214

 

 

 

5,210

 

 

 

3,305

 

Balance at end of period

 

$

(13,389

)

 

$

(13,827

)

 

$

(13,508

)