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Segment Information (Tables)
 9 Months Ended
Sep. 30, 2016
Segment Reporting [Abstract]  
Reportable Segment Financial Results
Summarized reportable segment financial results, were as follows:
 
Three months ended   September 30,
 
 
Nine months ended 
 September 30,
 
(dollars in thousands)
2016

2015

 
2016

2015

Revenue by segment:
 
 
 
 
 
GMBU
$
97,621

$
78,244

 
$
279,543

$
224,311

ECBU
74,351

69,326

 
220,887

205,625

IBU
11,030

11,181

 
31,926

31,995

Other(1)
61

60

 
154

132

Total revenue
$
183,063

$
158,811

 
$
532,510

$
462,063

Segment operating income(2):
 
 
 
 
 
GMBU
$
46,540

$
40,718

 
$
134,408

$
114,719

ECBU
38,696

33,568

 
113,186

99,522

IBU
1,064

2,431

 
3,126

5,823

Other(1)
(157
)
(219
)
 
(109
)
(276
)
 
86,143

76,498

 
250,611

219,788

Less:
 
 
 
 
 
Corporate unallocated costs(3)
(53,236
)
(47,975
)
 
(156,013
)
(141,162
)
Stock-based compensation costs
(8,818
)
(6,486
)
 
(25,005
)
(17,899
)
Amortization expense
(10,549
)
(8,069
)
 
(31,817
)
(24,286
)
Interest expense
(2,641
)
(1,816
)
 
(8,037
)
(5,375
)
Other (expense) income, net
(15
)
192

 
(185
)
(1,369
)
Income before provision for income taxes
$
10,884

$
12,344

 
$
29,554

$
29,697

(1)
Other includes revenue and the related costs from the sale of solutions and services not directly attributable to a reportable segment.
(2)
Segment operating income includes direct, controllable costs related to the sale of solutions and services by the reportable segment.
(3)
Corporate unallocated costs include research and development, depreciation expense, and certain corporate sales, marketing, general and administrative expenses.