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RESTRUCTURING ACCRUALS (Tables)
 12 Months Ended
Dec. 31, 2018
Restructuring and Related Activities [Abstract]  
Summary of restructuring accrual activity
Summaries of the Taqua Restructuring Initiative accrual activity for the years ended December 31, 2018 and 2017 are as follows (in thousands):
Year ended December 31, 2018
Balance at
January 1,
2018
 
Initiatives
charged to
expense
 
Adjustments for changes in estimate
 
Cash
payments
 
Balance at
December 31,
2018
Facilities
$
365

 
$
—

 
$
—

 
$
(332
)
 
$
33


Year ended December 31, 2017
Balance at
January 1,
2017
 
Initiatives
charged to
expense
 
Adjustments for changes in estimate
 
Cash
payments
 
Balance at
December 31,
2017
Severance
$
384

 
$
245

 
$
(49
)
 
$
(580
)
 
$
—

Facilities
218

 
508

 
—

 
(361
)
 
365

 
$
602

 
$
753

 
$
(49
)
 
$
(941
)
 
$
365

Summaries of the Merger Restructuring Initiative accrual activity for the years ended December 31, 2018 and 2017 are as follows (in thousands):
Year ended December 31, 2018
Balance at
January 1,
2018
 
Initiatives
charged to
expense
 
Adjustments for changes in estimate
 
Cash
payments
 
Balance at
December 31,
2018
Severance
$
7,595

 
$
14,735

 
$
(5
)
 
$
(20,415
)
 
$
1,910

Facilities
—

 
1,399

 
—

 
(628
)
 
771

 
$
7,595

 
$
16,134

 
$
(5
)
 
$
(21,043
)
 
$
2,681



Year ended December 31, 2017
Balance at
January 1,
2017
 
Initiatives
charged to
expense
 
Adjustments for changes in estimate
 
Cash
payments
 
Balance at
December 31,
2017
Severance
$
—

 
$
8,508

 
$
—

 
$
(913
)
 
$
7,595

Summaries of the 2016 Restructuring Initiative accrual activity for the years ended December 31, 2018 and 2017 are as follows (in thousands):
Year ended December 31, 2018
Balance at
January 1,
2018
 
Initiatives
charged to
expense
 
Adjustments for changes in estimate
 
Cash
payments
 
Balance at
December 31,
2018
Facilities
$
95

 
$
—

 
$
—

 
$
(37
)
 
$
58


Year ended December 31, 2017
Balance at
January 1,
2017
 
Initiatives
charged to
expense
 
Adjustments for changes in estimate
 
Cash
payments
 
Balance at
December 31,
2017
Severance
$
497

 
$
405

 
$
(26
)
 
$
(876
)
 
$
—

Facilities
—

 
126

 
—

 
(31
)
 
95

 
$
497

 
$
531

 
$
(26
)
 
$
(907
)
 
$
95

Summaries of the GENBAND Restructuring Initiative accrual activity for the years ended December 31, 2018 and 2017 are as follows (in thousands):
Year ended December 31, 2018
Balance at
January 1,
2018
 
Liability assumed in connection with Merger
 
Initiatives
charged to
expense
 
Adjustments for changes in estimate
 
Cash
payments
 
Balance at
December 31,
2018
Severance
$
1,916

 
$
—

 
$
—

 
$
487

 
$
(2,403
)
 
$
—

Facilities
205

 
—

 
—

 
399

 
(487
)
 
117

 
$
2,121

 
$
—

 
$
—

 
$
886

 
$
(2,890
)
 
$
117



Year ended December 31, 2017
Balance at
January 1,
2017
 
Liability assumed in connection with Merger
 
Initiatives
charged to
expense
 
Adjustments for changes in estimate
 
Cash
payments
 
Balance at
December 31,
2017
Severance
$
—

 
$
3,663

 
$
—

 
$
(158
)
 
$
(1,589
)
 
$
1,916

Facilities
—

 
431

 
—

 
(123
)
 
(103
)
 
205

 
$
—

 
$
4,094

 
$
—

 
$
(281
)
 
$
(1,692
)
 
$
2,121