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Significant Accounting Policies (Tables)
 12 Months Ended
Dec. 31, 2016
Accounting Policies [Abstract]  
Changes in the allowance for doubtful accounts receivable
The following table summarizes the changes in the allowance for doubtful accounts receivable for the indicated periods:
 
 
Balance at beginning of year
 
Additions charged to earnings
 
Uncollectible receivables written off, net of recoveries
 
Disposition of business interests
 
Balance at
end of year
 
 
 
 
 
 
 
 
 
 
 
December 31, 2016
 
1,942

 
297

 
(166
)
 
(853
)
 
1,220

December 31, 2015
 
1,950

 
869

 
(877
)
 
—

 
1,942

December 31, 2014
 
2,893

 
769

 
(1,712
)
 
—

 
1,950