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Accounts Receivable (Tables)
 12 Months Ended
Dec. 31, 2015
Receivables [Abstract]  
Summary of Activity in Allowance for Doubtful Accounts

Following is a summary of the activity in the allowance for doubtful accounts for the years ended December 31 (in thousands):

 

 

 

2015

 

 

2014

 

 

2013

 

Balance at beginning of year

 

$

5,207

 

 

$

2,688

 

 

$

2,515

 

Provision for doubtful accounts

 

 

3,004

 

 

 

3,504

 

 

 

1,515

 

Acquisition of businesses

 

 

—

 

 

 

—

 

 

 

163

 

Uncollectible accounts written off

 

 

(3,038

)

 

 

(985

)

 

 

(1,505

)

Balance at end of year

 

$

5,173

 

 

$

5,207

 

 

$

2,688