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CONSOLIDATED VALUATION AND QUALIFYING ACCOUNTS (Tables)
 12 Months Ended
Dec. 31, 2018
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]  
Summary of Valuation Allowance [Table Text Block]
Column A
Column B
 
Column C
 
Column D
 
Column E
 
Balance at
Beginning
of Period
 
Charged
to Income
 
Deductions
 
Balance
at End of
Period
Description
 
 
 
 
 
 
 
Reserves Deducted From Assets to Which They Apply:
 
 
 
 
 
 
 
Reserve for uncollectible accounts receivable:
 
 
 
 
 
 
 
Year ended December 31, 2016
$
2,945

 
$
1,435

 
$
(1,199
)
 
$
3,181

Year ended December 31, 2017
3,181

 
1,556

 
(3,049
)
 
1,688

Year ended December 31, 2018
1,688

 
1,069

 
(2,110
)
 
647

Deferred tax valuation allowance:
 
 
 
 
 
 
 
Year ended December 31, 2016
$
1,746

 
$
(713
)
 
$
—

 
$
1,033

Year ended December 31, 2017(1)
1,033

 
(809
)
 
—

 
224

Year ended December 31, 2018(2)
224

 
5,081

 
—

 
5,305

____________________
(1)
Reduction primarily due to utilization of foreign tax credits.
(2)
Increase primarily due to valuation allowance for tax capital loss carryforward resulting from Rigzone sale.

 See notes to the DHI Group, Inc. consolidated financial statements included elsewhere herein.